I built one for a friend last year. I got the crank and rods from 440 source. Made it a 457 3.900 stroke and .060 over and Trick Flow 240 heads. He hasn't cut it loose yet. It's in a 68 Plymouth station wagon it's a great combo. Just be careful and don't put too much cam in it for the street . His cam is about .560 lift and around 240 duration, flat tappet hydraulic. From Hughes. Nasty!