I have had a bog on my 400 for awhile. I believe I have it narrowed down to the accel pump might be a little on the lean side. It backfires from a complete standstill feathering helps.
What parts do you need to change in order to richen this up? runs great except for the little bog.
400 /727 256 comp cams 14* timing light springs
idles at 650 - 700 rpm holley 4160 carb running 5-6 pounds fuel pressure
thanks Mike