1972 340 TRW piston question

Compression ratio is a tool we use to estimate the cranking cylinder pressure, along with the Intake valve closing angle, and the elevation at which the engine will be operated in.
10/1 by itself means very little.
With iron,open chamber heads, the usual target is 160 psi, for WOT operation with best available gas; 91 (R+M)/2 octane or higher.
Wiki says Santa Rosa CA is at 164ft elevation, so you will have to be careful on your cam choice for 10/1Scr
The Wallace calculator suggests an Ica of 65* or more. IIRC, the factory 340 cam is very close to that, and I think it will work nicely; just don't expect any fuel economy with that cam,lol; she loves her gas.....
I have heard that CA gas is tricky to work with.
One thing you can do, is run alloy heads. I have run those at over 185psi with 87E10 gas with full for alloys timing, of 32 to 34 degrees. Others here on FABO have run up to 200psi on best gas. So that gives you a lot of freedom to chose components. But if you do that, I suggest to run flat-tops at zero deck, and closed chamber heads. After that you can do darn near anything. Like run a smaller more modern tighter LSA cam to get both STREET power, AND decent fuel economy.
Running your 340 up at 185 psi will make the bottom end feel like an iron headed BigBlock of yesteryear.