Stumble under acceleration

[JacobAndrew]

I put new (bigger) jets in my '79 and now it stumbles under heavy acceleration. Judging by the plugs it seems like it's running to rich. The carbs are synced, with our new homemade sync tool but it still doesn't seem right. Thanks for any help.

[Incubus]

Go back to the smaller jets. I've never had an issue with stock jets, and that is running a K&N filter and 4-1 exhaust. With pods you might have to bump up one size, but if you are running rich and stmbling with bigger jets that would seem to be a clue.

Patrick