OK. Then it does seem like the benefit of additional timing at idle is the effect on the idle circuit. I don't see why else it would run strong with 18* in gear with FI and not so with the carb. Need to find some Carter/Rochester guys that have run them on radical engines. Its done. Just less common.
This is about all I know is the theory. Operational theory of the Carter idle restricions & air bleeds
Change any links to imperialclub from .org to .com
Also with the FI it controlled the fans and it would bump up the idle when the fans came on. FWIW the motor doesn’t seem to care where the timing is except for at idle, it runs like a scalded ape when you push on the pedal! LOL
