I set timing to the 1974 (no cats) spec of 5 ATDC and it ran great, however when I came home I was going to check the varying degrees of timing at the different RPM's I noticed the timing at 750 RPM's went to 12 ATDC.
Does timing need to be done with hot or cold engine?

I do not know if I want to mess with because it has never ran better... SO FAR!