I have a fairly new holley 750 w/ vac. sec. and elec choke. (not dbl pumper) on my 350. Its got the zz4 heads, headers, etc. the cam is a .494 lift cam on intake/exh. sides. When i am driving and i give it a little gas on the go it boggs, and when i am from a stop and launching it boggs. I have adjusted the timimg to compensate for this, along with the replacing the power valve and the accelerator pump. I was wondering if anyone knows how i can fix this, or if i should go and get a new carb. I have been looking at the new 670 street avenger. is it possible i am over carbing my motor?

 

It sounds like your accelerator pump isn't giving a big enough shot when you hit it. You replaced the accelerator pump, was it the same size, bigger or smaller? I think if you adjust for a bigger shot you'll be fine.