Put a Champion 526 radiator in a 71 swinger?

What alternator do you use?

It's a TuffStuff 100 amp alternator.

Has anyone ever used the Painless Dual fan kit part number 30117?

http://www.painlessperformance.com/webcat/30117

No, but it seems like a lot of money to not be able to change your activation and shut off temperatures.

I have more than that into my Dakota Digital controller and harness, even sourcing the fan harness from the local yard. I bought an extra 70 amp relay (for 2 total), a 60 amp maxi-fuse and the wiring for the controller. But, I can also program my fans to activate and shut off at any temperature I want, set the amount of time the fans will run AFTER I shut down the car (with a built in battery protection setting), set controls for both the high and low speeds of my fans, and change the activation/shut off temps with the push of a button. Which means I can change the activation temperatures for different weather conditions, if I go to the track, etc.

I probably have $180 into my controller, harness, relays and fuses, but the extra functionality is more than worth it.