How much does temperature affect motor?

64mopar said
Is it a stock/off stock or built motor?
If it needs to idle that high,there are other issues that are contributing to your problems.
Vacuum leaks causing lean conditions will add to heat issues.
Check distributor function, timing advancing?
Full advance?

Engine is 100% stock other than the intake/headers. I will check again for vacuum leaks. While idling in park I was getting about 17-18* of vacuum if I remember correctly.
Distributor is stock style electronic ignition and also untouched/stock.
Timing is advancing as it should. I forgot the the exact number but it would reach the mid-30s* with the mechanical advance. vacuum canister in the dist. was tested and not leaking