I wound up using a fan from a Crown Vic Police car. I don't remember the diameter, but it was thin enough to fit without touching the waterpump pulley. I had to notch out the top of the fan housing in two places to make it fit flush with the radiator, and I used plastic trans cooler mounts that go through the radiator fins to mount it. I have a 304 v-8, I imagine that it probably makes the same amount of heat as a Chevy 350. The only thing that might be different is your space between the water pump and radiator. The fan cost me $25 at a swap meet and works great.