sounds like the cam is retarded about 8 degrees from an 067 on the intake side, about 5 degrees on the exhaust side, and just a hair more duration and lift. What octane fuel do you run?
A "Cheapy" timing light is not an advance timing light, which is the only way to set total timing without a timing tape or marking the balancer. Balancer drift is always a possibility as well.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching
