What size electric fan?

I'm pretty sure you will be pleased. I had the Zirgo ZFB16F 3000cfm on this car but since there is so little under hood space with the fenderwell headers it can't move the hot air out and would not keep it cool if I got into any traffic. This Taurus fan and shroud cools it with ease! Plus it was 35 bucks from the local wrecking yard. Here's some more photos and measurements for anyone interested.

Taurus fan dimensions are approx 18.5 x 23 x 4.75 inches, and 17" blades. As you can see there is some room to trim the edge and the motor being offset helps clear the water pump.

The Delta current controller is a really nice feature if used on a street car.