With the greater heat loss from aluminum heads you could go up to 10.25 compression and run the same octane fuel you are now and not have a knocking or pinging issue assuming your Cam is not too small.
On the Edelbrock and other off the shelf aluminum heads they make the 72 CC chamber deeper to get to the 87 CC range and to convert your 72s to 87 is no small job!
I would sell your heads and see if you can find a used set of 87 CC Edelbrocks or kRE heads.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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