Running stock 302 - 11:1 Pistons, 30-30 cam, 480 dist, etc., and it idles just like it should with the 780 carb. 900 RPM. Only mod to carb is bump of primary jets from 68 to 72. Vacuum 8-11 in-hg at idle. Dist at 12 degrees initial. Runs and drives fantastic on the street with pump gas.