New life for an old 340 (stock stroke)

Got one similar I was going to put together. 70 340 block, .030, Trw stock replacement pistons, stock steel crank and rods, X heads and a old purple stripe cam .557 lift. Going to try to clean up the heads myself, 60 cc combustion chambers already. Would like to have the pistons lightened, think they are at 960 grams each now. Just a bunch of parts I have laying around. Also got another 340 block that must be final honed to .060, could use that also, but figured pistons would be custom. Thought it would make a decent street engine cheap.