An electric fuel pump won't help you at all. You need EFI or Propane to fix that problem. You low pressure mech pump will do the same thing as an electric fuel pump. But I have a new one I'll sell you if you really want one.
My dad has a complete 302 ford EFI setup he will sell if you're interested
new to EFI can you put a big cam in it. aclose freind had his motor work on. 350 boroed 20 over with 268 dur cam and would not idle. was that normal our the shop was not doeing some thing right. it was EFI
I had the same problem with my 650 Holley. I adjusted the floats in the bowls helped some, still annoyed me thou. Bought a Truck Avenger Holley & haven't had any problems at all. You could try fabbing up a vent tube like on the TA with the small holes drilled in it. May help.