Kevin and All,
Your engine should be 9.7-1 compression if it hasn't been modified and
and running 91octane gas you probably should be ok at around 5 or 6
btdc...less than halfway down from 0 to bottom of markings plate. If
your car came from a low elevation you'll have some carb work to do too,
I think.
Dave
67 HAZE GREEN Sedan
Covington, Wa.