Stroke old 340 or new crate engine

If the 340 runs, set it aside.
Get a 360 block, probably cost you 100-200 bucks, then just buy a rotating assembly from scat or Ohio crankshaft. If you want to make a real streetable 500 hp...you'll wanna get heads that are strong in the low- mid lift.
As well as peak. Say they peak at [email protected] better flow around 250 by .400
That's how i see it.