Guess The Compression Ratio

I'll check the timing this weekend. Detonation is at WOT only, no particular RPM. No problems at cruise or part throttle acceleration. Too much advance? I'll also try to ID the distributor. Looks like a Mopar unit, but not sure at this point. What should timing be set at?

It pulls hard at WOT although I haven't had it there for any prolonged amount of time due to the knocking.