The official FABO machinist/member collaboration, busted 340 thread
The donor crank should grind ok if it isnt .020 already...even then...but, of course whos standard/expectation are we going by 'so to speak'. A cast crank would be fine. Stock 70's truck or scat. Only adds to the balancing part if using a 318 base crank.
Good going on helping this guy.