holley carburetor

Any holley experts in the group Here's what I have sbc 350 stock it's a Holley 670cfm jets are size 68 and squirt nozzle is a .35 not a double pumper My issue slight popping in exhaust while accelerating more like a pff pff pff. It's very random sometimes at accelerating and sometimes at...

I have a Pontiac 400 with 700r4 an Holley 600 carburetor. Car idles pretty good but when I go to put it in drive it just cut off. Not sure what it could be ,any help would be appreciated.