[blykins]

10.5:1 is not high compression.

Almost every one of my engines leaves here with 10-10.5:1 and will easily run on 91-93 octane.

That camshaft *should* work unless it was installed way advanced.

But something is really wrong if you need race gas, retarded timing, and a slow curve in a Cobra....

I'm glad your mechanic owns a COPO Camaro, but he should have all kinds of warning sirens going off in his head right now that something is not right.