My #3633, with a 351W, stroked to 427, had an occasional problem, usually after refueling, but is now constant. If I take it up to 3500-4000 rpm, it starts to die. Sometimes completely, sometimes where I have to pull off the road, wait a few minutes, then restart, but can barely keep it going. Pumping the accelerator, does no good. I cleaned and regaped the plugs to .40 (recommended for this engine), replaced the MSD cap, rotor, and magnetic pickup (with MSD parts), replaced the MSD 6AL module (10 years old) with a new one, new MSD coil (blaster model), new in line fuel filter (the pretty canister was empty, so added one) prior to the Holley electric fuel pump (which is pumping 10psi), checked the solid fuel lines going into a Holley 750-double pumper carb, and pulled the carb to inspect float tanks for debris (there wasn't any). Prior to removing, I checked the accelerator pumps, and they are squirting fuel fine. I plan to rebuild it anyway as soon as the new Holley kit arrives. Meanwhile, I drained most of the fuel from the tank and saw no evidence of water or debris. I took out all the screws from the tank sending unit with plans to remove that for a look at the 'pickup'. According to my Pantera manual, it should come out without removing the tank, but I am unable to get it past the white switch in that line. The car was restored in the late nineties, but pretty sure the tank is in the same location, so why won't it come out? The only other 'suspicious' thing (to me) is that I have a 'cap' on the top of the tank (part #7033006?), but that appears on the tank diagram in my book. I do NOT have a vapor separator assembly that went to a canister assembly on the original setup. I DO have a small 4-5" tube that faces down on the first 2" on the fuel filler pipe that (my guess) is acting as a vent to replace to vapor separator, since it is not shown on the filler tube in my repair manual. When cold, the car starts fine, even without a choke. I could drive it gently down the street, but then trying to go up a small hill it starts choking, then dies. Yes, I have about 7-8 gallons of premium fuel and an octane booster additive in the tank. So, IF I can get the sending unit out to check that, I will be at the limit of my mechanical knowledge and will likely have to tow it to a shop (somewhere in the Atlanta, GA. area), to be fixed unless one of you kind experts can tell me what else to check. Happy to provide my personal email or phone for a conversation outside of this POCA email string. Thanks for any assistance on getting the sending unit out or the main problem of stalling. My #3633, with a 351W, stroked to 427, had an occasional problem, usually after refueling, but is now constant. If I take it up to 3500-4000 rpm, it starts to die. Sometimes completely, sometimes where I have to pull off the road, wait a few minutes, then restart, but can barely keep it going. Pumping the accelerator, does no good. I cleaned and regaped the plugs to .40 (recommended for this engine), replaced the MSD cap, rotor, and magnetic pickup (with MSD parts), replaced the MSD 6AL module (10 years old) with a new one, new MSD coil (blaster model), new in line fuel filter (the pretty canister was empty, so added one) prior to the Holley electric fuel pump (which is pumping 10psi), checked the solid fuel lines going into a Holley 750-double pumper carb, and pulled the carb to inspect float tanks for debris (there wasn't any). Prior to removing, I checked the accelerator pumps, and they are squirting fuel fine. I plan to rebuild it anyway as soon as the new Holley kit arrives. Meanwhile, I drained most of the fuel from the tank and saw no evidence of water or debris. I took out all the screws from the tank sending unit with plans to remove that for a look at the 'pickup'. According to my Pantera manual, it should come out without removing the tank, but I am unable to get it past the white switch in that line. The car was restored in the late nineties, but pretty sure the tank is in the same location, so why won't it come out? The only other 'suspicious' thing (to me) is that I have a 'cap' on the top of the tank (part #7033006?), but that appears on the tank diagram in my book. I do NOT have a vapor separator assembly that went to a canister assembly on the original setup. I DO have a small 4-5" tube that faces down on the first 2" on the fuel filler pipe that (my guess) is acting as a vent to replace to vapor separator, since it is not shown on the filler tube in my repair manual. When cold, the car starts fine, even without a choke. I could drive it gently down the street, but then trying to go up a small hill it starts choking, then dies. Yes, I have about 7-8 gallons of premium fuel and an octane booster additive in the tank. So, IF I can get the sending unit out to check that, I will be at the limit of my mechanical knowledge and will likely have to tow it to a shop (somewhere in the Atlanta, GA. area), to be fixed unless one of you kind experts can tell me what else to check. Happy to provide my personal email or phone for a conversation outside of this POCA email string. Thanks for any assistance on getting the sending unit out or the main problem of stalling.