Make sure the idle speed screw returns firmly against the stop with choke off hot. It may need more return spring
Make sure the mechanical advance is coming back to zero at idle in and out of gear. The mechanical advance may be sticking or have weakened aftermarket springs giving erratic idle.
Hot fuel pump pressure would be another check. Be careful off fire.
Confirm the above then adjust mixture screws and throttle stop @ off the highway temp.
And leave the 180 as is.
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk
Last edited by Blued and Painted; 06-18-2017 at 10:07 AM.
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