I used a 95-99 Ford Contour V6 fan on my small block. Since I did no clearancing whatsoever with the small block, I'll bet you could get it to work with a big block.




This is a twin fan setup with two speeds. There is a pretty high amp draw on HIGH, but low isn't too bad (I belive 15-18a)

It will cool my 470hp 340 all day when its 90 out and cycles between off and low even when idling. My water temp never goes over 195.

You will need:
two 70a relays
60a Maxi Fuse
Upgraded alternator/charging system wiring (I use a 78a Delco 12si which is fine)
Fan controller that will support dual speed fans (I have the dakota digital one)

This fan setup has wicked airflow, and they are easy and cheap to get. Its also very quiet.