I'm running an electric pusher fan on my '50 Chevy 3100 with a '62 261 install, mainly for clearance reasons. The fan needs about 4" of clearance. I have it on the grille side, and it fits great. I used two horizontal pieces of strap steel to mount it to the radiator brace.
There are some low profile fans available but they can be pretty loud.
It uses a thermostic switch and draws 15 amps, so you need a good alternator. I'm running a 17" 2000 cfm fan. You will want the biggest fan you can get in there.
It is perfectly quiet when the fan isn't on. When it comes on it isn't overly loud. I like it.
