compression test question

The cam timing is +4deg advanced. The rest of the specs are:

254 / 266 Advertised Duration, 110 deg LSA
0.435" / 0.435" Theoretical Lift
210 / 218 Duration at 0.050" Tappet Rise

I do recall the head gasket appearing like it was pretty much all-steel, so I bet that I have one of the thinner varieties.

I am 99.9% sure that the engine block was bone stock. I do know the head was shaved either a total of 0.020" or 0.030" from stock.

I may end up converting the distributor to an HEI setup so that the EFI computer can control the timing, in the event that I still get pinging with 92 octane fuelwith the new distributor and corrected initial timing. That way I can custom-tune the advance curve, by trial and error. I'll report out in about a week, when all is (hopefully) said and done.

Appreciate the feedback, guys.