Need a plan - component selection for restoring 68 340 that runs on 91 oct

ir3333 said

Use a sealed power C28P, a stock replacement cast piston that sits a hair below the deck.

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428P..... but not a direct replacement for the original '68 piston. Not a bad choice but the L2316F would be closer.

Not at all sure if the OP wants this 'original' on the inside and out, or just the outside.....