[SemiFast]

The Wiseco company makes pistons for a lot of the older machines, new too of course.
If you still have an original piston they might want to have it in hand as a way to match something they have that will work.

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[SemiFast]

Is this a metal gasket?
I've seen guys get away with reusing metal head gaskets by stripping the existing finish on it (lacquer thinner or acetone), and then spray painting a coat (1 coat only) of paint on both sides.

Paint that is aluminum in color has (or had) aluminum in it. The aluminum will spread to lower areas and provide a good seal. Put it together when the paint still tacky.
Note: ^
Information form the Hot Rod Chevys I played with back in the old days. Proven to work (back then) with composite head gaskets.

S F