I have had similar problems trying to get a Holley 395 to run on my 302 GMC. The thing would not quit bogging down on takeoff. I fooled around for months and bought 10 power valves. It would go great once the bog cleared. Seemed like it could not adjust to low rpm and air speed. I gave up.
I have been running 3 Weber 32/36 carbs on my GMC for 24 years. They work fine but you really need a manometer to balance them accurately. They run well at all speeds especially in the transition from low to mid range and then high speed - no bogging with the Webbers.
