Chevr aulait,
I did a little search, and all it shows is the reference to alignment with the steel ball in the flywheel.
What that equates to in degrees BTDC I don't know.
If you think your heating problem is timing related, I would think you should have at least a little ping.
The SOP is to advance the timing until you hear the ping, or see the temp go up...then back it off until you loose the pre-ignition and/or the elevated operating temp.
I know this doesn't answer your question, but these are pretty unsophisticated engines.
Stuart
