I believe the max you should go on pump gas is around 185psi which would be 35cc domes. 33cc domes if you can get the good premium (93 octane plus). Anything squishier than that you should go with race gas.
Not 100% on this, so please correct me if I'm wrong.
I've been reading that blue (that builds engines with/for jetmaniac) pushes 220+ psi on pump gas. He sets up the engines specifically for this, porting, squish and jetting.
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