273/904 in and runnin!! Coolin advice please.

Just fired it up a couple days ago and it's runnin great. Thanks ta all who helped me with the wiring and such. Here are some pics. Any input on how many cfm's I need on a pusher fan ta cool it. I have one now not sure what it's pushin but it's not enough.I used a mustang 351 swap radiator( copper 3 core). I hit 220 and risin goin over the hill and had ta turn around. Oh well, small potatos compared ta the swap. WOO HOO!

 

You're supposed to mount the engine and radiator so there's room for a normal mechanical fan between them. Any way you can move things around to make room?

Good luck on the pusher....it's usually not a very effective setup.