To separate the idle cam from the choke

Trailbeast,
Police cars used to have an idle step up control, had a couple early 80s Diplomats. Decades ago, but think it was a T- handle, pull it back, twist to lock.

Your post suggests EFI and electronic advance in your future.... With idle air, control, and ignition timing with temperature adj, your idle and overall running can be perfect all the time. :)