Selecting cam to work with A/C

I would consider looking to your emission-era brethren for some tricks.
First, what ignition are you running? If it's a stock Mopar electronic ignition distributor, look at the dual-pickup models. There is the possibility that you can set the timing on the other pickup for a bit more retard at idle and a simple relay to kick it over when the AC is on at idle. This can help with idle and overheating.

A solenoid to kick the idle speed up is also an easily pirated item that can kick up your idle speed an adjustable amount when the AC is on.

A microswitch on the throttle will turn both on at idle when the AC is energized, and off when you're taking off or cruising. When the AC is off, the whole circuit will be off and it's just a normal non-air setup.

That's basically what the PCM in later Mopars do, just electronically.