I stayed with the stock AD radiator and 350 with a belt driven fan. I didn't want another maintenance item. I used an empty pizza box to make a pattern, had to relocate my radiator mounts to get enough room, in hind site I should have put the motor back a little farther. See it
http://community.webshots.com/user/zeker6
look under Zekes'AD, Zeke

The Amish Connection
51 Chevy 1/2 ton 5 window,Vortec hotrod, no horse