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I have rebuilt a standard engine with my race ported head running SP cams.
My race engine had a modified block which had been machined with no base gasket and modified piston heads.
But with a std block would removing the base gasket raise the compression without the need to modify the pistons to clear the valves?

should be ok to remove the base gasket

To be clear the std cylinder block is running std pistons without any modifications...

I remove 0.35mm from the head and run without a base gasket without any issues although I do run the valves at race clearances (.25mm and .20mm) so you should have no issues at all.