Incorrect Timing Adjustment causing heat issues?

As some 64,65,66 Dart owners got into this (@slantsixdan) he brought up the point that although I have a closed crank case system ventilation system that was not truly cap and should not have a cap timing curve in it as that was not available in 65 even in California.
Edit: I will add though when I purchased the car it was set a 5 ATDC with the vacuum advance connected for base timing. I initially adjusted that to 5 ATDC with vacuum advance disconnected and made a significant difference with cooling. It also seemed to jump to a reasonable advance on the smallest amount of throttle opening. But I am nut sure if that is a function of the vacuum advance or if that is a mysterious CAP timing curve where it shouldn’t be