Sorry about being out of this thread for so long. I took the week off work to concentrate on building the hot rod.
Andrewh came over last night to finish up the wiring and help be drop the engine in.
I won't have it running this week. There simply isn't time.
Once it's up and alive, we can either test the fan controller on his car or the hot rod. Both of us have charging systems that can easily handle running the fans.

I'll dig around and see if I can come up with another old style fan.

What was the longest you were able to run the fan?
If you still have the 30 or 40 amp alternator in your truck it will definately have a hard time. You will need to keep the RPM up.