I cut the extra brackets off the fan with a sawzall and mounted it to the radiator with 3 big wire ties, two at the top and one at the bottom.
I ran power direct from the battery to a 30 amp fuse, then to a 30 amp relay, over to the fan. Got the relay at the aux lighting section of Autozone. I control it via a toggle switch in the radio delete panel, from a switched power source, the old radio power wire, I think. Put a couple more wire ties around the inside wires. Its worked for 2 years. The radio delete panel was made from old paneling from the living room makeover, and it matches the 82 dash woodgrain. I splurged the extra money to get a lighted toggle switch.
I definitely,highly, recommend the higher capacity and quality Borsch relay mentioned by HISSIN50.