Maybe this might help as I ran into this common problem too. I have a Champion #526 radiator in my 72 Demon. 408 stroker motor. I looked at MANY different setups and ended up using a Jegs #555-52115 dual fan assy. It took a bit of fab work using little screws and such but I was very happy with the clean look once done. I control the fans separately with switches and to date, this setup seems to keep the engine cool even in 90+ deg weather. Some pics:
View attachment 1715775786
Here is the fan unit itself mounted to the rad before I stuck it in the car. Note that when I installed it, I also added some flat alum strips to close the open gaps where the fan barely extends past the rad on the sides.
View attachment 1715775791
Hope this helps!!
