I just finished installing a new 350 crate motor (goodwrench 250hp) and I pulled the computer controlled quadrajet off of the 305 and put it on the 350. The only problem is, that I am using a vacuum advance distributer instead of the mechanical one. I know that the distributer and the quadrajet are linked by the computer. The car idles ok but is very rough. I can seem to smooth it out. Any ideas?

thanks