Def could use some advice on this one lol. 55 292 with an auto trans. Magspark distributor ( no vac advance). Sprang for the mummert low rise intake. A close friend gave me a brand new edelbrock 1406 electric choke. Got it all installed and dialed it timing at app 6 degrees. Have idle mixture screws right around two turns out. Spent quite a bit of time ensuring no vac leaks anywhere. Idles great and off idle seems Good as the accel pump kicks in. Under load, like mid throttle taking off from a stop, falls on its face and starts breaking up. Pulled plugs, color looks good and doesn't seem to be rich or too lean.

I know the carb is probably a bit much in terms of cfm but.... Wouldn't think it would be drastic an effect on drive ability. It breaks up so much so that without some feathering of the throttle is may stall

Any help would be greatly appreciated