'65 Barracuda FS 273 4bbl 10.5 CR on pump gas in CA

So...getting close to having my original '65 Commando 273, 10.5 CR ratio engine rebuilt. I want to keep it stock with domed pistons, iron heads and factory cam. The rebuilder I am considering asked me about reducing the compression ratio by installing flat top pistons, and I told him I really did not want to do that, and that I would ask the list about it. If you are in California running this same engine with domed pistons, are you satisfied with the performance using high grade pump gas? Should I be concerned? As a side note, I have a '61 Chrysler 300G 413 with 10.1 compression ratio that runs fine on high grade pump gas, so I was thinking it would be OK with the 273 as well. Am I in for problems with a stock rebuild?