Please don't take some of these responses too harshly because basic questions like these really have been asked thousands of times here and there comes a point where there really is no reason to keep answering. It's not intended to come off as a bunch of jackarses here rather it is to try and encourage people to research their questions, especially the basic ones.
Anyway, a 383 uses a 400 crank or an aftermarket crank with the same stroke length. A true 383 would have to be a 350 block bored .030 over. But don't sweat the small stuff. If the block doesn't need to be bored at all or it needs .060 then just take whatever it needs. The relatively small difference in cubic inches won't make a terribly big difference in power.
Last edited by Blazin72; 05-22-2012 at 08:19 PM.