I am still battling my 390 Ford lifter/push rod issue. I have not worked on it since last weekend when a fuel issue kept me from the lifter investigation. I shimmed the rocker stands for a temporary test,,,another story. I wanted to run it for a while to warm it up. I have an Autolite 4100 4 barrel on it with a new mechanical fuel pump. I put a kit in the carb, new brass floats. It ran about 10 seconds and then gas would come out of both top cover vents, flooding bad. The front first, secondary about a second later. I set the floats probably 10 times and had them laying almost on the bottom of the chamber, same flooding. I pulled both needle and seats, nothing going on there. I changed floats back to the plastic ones that were in the carb,,,same flooding no matter where I set them. I thought the fuel pump maybe had a relief valve problem but was told they don't have one. I put on a small electric one this morning that I have used for temp jobs before. Now it will sit and idle no problem at all with the floats or carb. I have bought another mechanical pump, but not sure if that is my issue or what. Am I missing something?