[Trans-Am Jim]

With dual quads and my cam (Lunati performance grind):

At 11 degrees initial, idle fuel screws adjusted according to Holley, and throttles completely closed, the car idled @ 1300

Leaning out the idle fuel to reduce rpms just resulted in a surging idle. Backing down the initial advance to 9 and setting the idle screws where they're supposed to be, allows me to crack the throttle a scosh, getting a real nice idle mixture, and an idle rpm of 950.

The car will idle all day at that with no stumble on acceleration. No load-up or stench because of a too-rich idle.

Jeff is right on about the breathing of highly reworked or aftermarket heads heads. I have the iron MRs that flow like crap.