Running rich....To big of a carb or?

A carb is never to big. and the jets are usually right. Air bleeds and power valve is all you need to change. I have run a 850 on a stock stroke 340. A six pack is 1300+ on a stock 340. Air bleeds are your answer.

Timing could be locked a 36 and it would run the same. Big cam/ motors make less vacuum so big carbs work with the original bleeds. a small cam/ motor makes more vacuum so you need to open up the bleeds for lower RPM mixture with a bigger carb.

You could add an X pipe . That should suck the extra gas right through. LOL