base timing keeps advancing by itself...

smokinnjokin said
Well that turned out to be a rabbit trail. Rebuilt distributor, reinstalled in car... and EXACTLY REPLICATED the issue. Warmed up, set base timing to 12, went for a spirited drive, started rattling at 2k-2500... checked timing again.. up to 22.

At this point, evidence seems to be pointing to timing chain/cam gear.

OK it followed using another distributor, I am assuming a points one sice all the electronics are in a petronix. Really a weird one Cooling down sure seems to be a electrical issue. What exactly is in your ignition ststem from the ignition power all the way?