Keith, I have a '57 with a 235. When I added A/C, I installed the condenser in front of the radiator and installed two 9" electric pusher fans in front of the condenser. The fans work off a relay that powers them when the compressor turns on.
I did it more to increase air flow over the condenser coils at idle than to cool the engine. But to your point, you'd wire the fan to push air.
You have to be careful when combining an electric fan with a fan run off the engine. Sometimes the combination can create a vortex that actually reduces effective air flow through the radiator because they work against each other. I got lucky when I did mine, but I knew that there was some risk. I figured I'd experiment with trial and error...and I got lucky.
If you need more air flow, you might want to consider a six blade fan as an option instead of the pusher fan. The six blade fans were a dealer option to increase air flow.
Matt
