8BA running rich

[waltere]

I would like to pick some brains. I am running an 8BA, with a 30 over bore, 4" crank, Isky 400 cam, and a pair of 97's. I have them jetted with 45's and uncertain of power valve size. The motor runs great but seams to be rich. (smells rich, plugs are black, tail pipe black), I friend is suggesting progressive linkage and plugging the idol circuits on the rear carburetor. Can you give me any advise on what to do in this situation.
Thanks in advance
Walter