Took out plugs and ran compression test... have some questions

I went to re-gap the spark plugs and took them out. Five of them were oil-fouled. So we ran a compression test and the compression came out fine. So I guess the oil problem is with the valve stem seals?

Also, on our old engine (also a 351w, originally a 2 barrel and therefore a 9-9.5:1 engine) would usually show compression readings for 140-160 psi on all cylinders when healthy. This engine showed readings of 180-200 psi on all, which is more indicative of the 351 4 barrel (which I think was 11:1 stock) version... would you all agree? This would explain the ping I've been experiencing, and would also dictate what I should gap the plugs to.

Thoughts on both?

actually, i was hoping for more confirmation of my guess as to the compression. Does my assumption of a higher-compression engine make sense? Either way, I'll be using 91 octane in my next fillup (I live in Cali).

and as far as the gap goes, I'm just going to set it at what MSD says to set it at and leave it be.