posted April 19, 2004 10:32 AM
I would do three things, at least to start:
1. Rebuild the carburetor, just on general principles. A fresh set of gaskets, a new needle & seat, etc. wouldn't hurt a thing. The 2bbls. are a snap to rebuild.
2. Check your fuel pressure. If it's 8.0 to 8.5 psi (which I strongly suspect it is), get a good fuel pressure regulator, like the Holley 12-704, plumb it into the fuel line after all filters and set the pressure at 4.5 to 5.0 psi. That alone should make quite a difference.
3. Setup your idle system properly. Make sure the butterflies are within .020" (eyeballing is good enough) of the bottom of the transfer idle slot at curb idle then adjust each mixture needle for the highest idle RPM, i.e., find the "sweet spot" where turning each mixture needle one way or the other lowers the RPM. Don't sweat the exact idle RPM as long as you find the sweet spot and don't worry about the mixture needles winding up the same number of turns out. If you have to open the butterflies somewhat to get it to idle right off the bat, adjust the mixture needles for best RPM then return the butterflies to the correct position. Having the butterflies in the correct position at curb idle and optimizing the idle fuel mixture will also help quite a bit.
Try the above then come back to us if you have any more problems.
Earl Parker II