Need help NON mopar 1967 Pontiac Lemans 326

Ok. Then I would start at about 16* and work your way up. It will probably take a good bit of initial timing. Pontiac combustion chambers are machined very smooth, so hot spots are not a problem. The compression is probably a true 8.5 or less, so I am sure it will like a lot. Basically, keep creeping it up until you either get starter lug or spark knock and then back it off. But you will also want to end up limiting total timing to around 34-36* with the vacuum can unplugged and around 3K RPM.

Does that help?