Idle mixture screw settings are specific to each vehicle. The way they came preset is just a baseline to get it started and idling. With as much timing advance as you have at idle I wouldn't expect them to do much.
I can't give you a good baseline for the engine deal your running, but I am sure someone here can.
based on your info
A 13 initial
B 20 mechanical
C 23 vacuum
36 at idle
33 at wot under load (assumed)
56 total cruise rpm/light load
I'D GO ABOUT IT A DIFFERENT WAY, see what the PONTAC experienced people have found to work with that type deal.
Do you know what you cranking compression psi is ?
Time to start a tuning thread!!
