compression ratio vs octane

Thanks for the reply guys.

I have iron heads, I think they are off a 360 instead of the original
70 340 heads and by looking inside the plug holes the pistons are flat
tops. I dont know if anything was decked or not.

I was fooling around with curving my distributor and changing and jetting
carbs so I need to get my plugs cleaned up and then take a look at them.

It's really hard for me to hear and tell, I need to try to adjust the valves
again to see if that will quiet them down some (it has crane gold rockers)
and fix the header leaks, but even then it's hard to tell. The car seems to
like to run a little richer than lean for sure, there is a big difference
between a holley 3310 and a street avenger 670 given same jet sizes
in both.

I will go ahead and pull a few plugs and look at them to see if I can find
anything under magnification.

I was thinking that my valve clatter might show up on a knock sensor, so I
guess that option is out of the question.

I have my timing set up now so it's at 16 before at idle and 34 all in at
2500 rpm but I do not have the vac advance set up yet. Really wanted to
make sure I have no knock before I hook that up.

I've been reading the last few days about detonation and I know it's hard to
come up with any real numbers because there are so many variables so
anything you guys can share is VERY much appreciated.