Hang on Mr /6, 9.0 is a world away from 8.1, lol.
Do yourself a favor and get an accurate compression test.
Accurate,as in: warm engine, fully charged battery, all plugs out, ignition disabled,and carb wired at WOT. With a known good gauge, crank until you get a minimum of two consecutive SAME or nearly the same,readings over 120 psi . Then you'll know what you got.