The 360 build that has more turns than Willow Springs

If your machinist skims the decks & surfaces the heads, chase the threads & use a quality gasket & you should be fine... You don't know enough about that engines past life to know why it failed.. possibly tune, possibly assembly errors...

Before I accept that it was just a regular tuning issue I'd be suspecting the guy tried nitrous.. More engines are hurt by first timers playing with nitrous without learning enough about it first than guys who seriously run nitrous...