Working this combination with a stock LA deck height, a standard Felpro 8553PT head gasket at .051" thick, 1 cc in the crevice down to the top ring. and .060" over bore, I come up with 9.85:1 SCR. So the 10.5 numbers are not quite right. You are better off than you think...
What you really care about is the DCR (dynamic compression ratio) which varies with the cam and cam timing, and ultimately the effective DCR, which drops with increasing altitude. The altitude in Tulsa is <1000' so you can pretty much forget about any altitude effects. But the cam is going to vary the DCR.
So we need some cam info to say further. If you really need/want to drop SCR and DCR, then this may be a case where an older type, slow ramp, 'long-tailed' cam will be right.
If you want to use E85, check out all the articles online... they will all tell you that E85 can run with much HIGHER SCR's. So E85 on this setup would leave a lot on the table.
As for AL heads, I am not aware of any in that chamber size. But the extra breathing would indeed be nice.
BTW, you can easily add 2-3 cc's to your existing chambers with some valve work and some very mild grinding in the chambers. I've takne 75 cc heads up to 83-84 cc's. (And did not hit water! Whew.) You can polish the chambers to help fight detonation and get out some material at the same time.