[jpabberton]

I put a new Edelbrock 650 on my otherwise stock, except for intake and HEI, 350. It runs great for a few days, starts right up and and idles nice, but then it blows black soot out the tailpipes and wont't idle. It stinks up my garage and burns my eyes. Smells like a warn cam but the engine is a brand new crate from GM. I adjusted the A/F screws, but can't get it right. In fact, when I take them all the way down the truck still runs rich. I even took out the A/F screws and blew out the carb.

I have replaced two of these bad boys and have now ordered a Hooley. Any suggestions? Could the distributor be off a tooth or timing chain?