A pusher fan is not as effective as the sucker fans currently available. I recently
upgraded mine, and while I am still putting together the story for my website
http://geocities.com/provamo72/ you can order the same package I did.
www.summitracing.com. The product is Flex-a-lite (Part # flx-220). You can order with or without the adjustabe thermostat. The cost without is USD$179 (without thermostat) and $20 more with. It comes mounted in a shroud. I took my (nearly) stock radiator and had a couple of brackets fitted to hold the fan assembly (don't use zip ties !). I also flipped the upper radiator mounts around to face backward versus forward, which allows the radiator to lay forward. Not necessary for clearance with the new fans.
The max current is 19.5 amps, and airflow is ~2000 CFM (Cubic Feet per Minute).
Chuck Melton
