Electric fans and shroud recommendations

On my 73 big block dart with a i guess 550 HP 440. I used a summit 2 core 27.5x19 aluminum Radaiator and a Ford Tours fan. It is a single blade fan that is off set some and is a 2 speed fan. I drove the dart on the street a few times and on a 90 degree day . The car never got over 190 degrees.. the dart ran 10.49 at 126 in the 1/4 at 3400 pounds.
On my 91/96 dakota sport with a 11.1 360 magnum engine. I used the factory radiator with a dual fan set up from a 06 5.7 dodge charger. It seems to cool allmost too good. I have it wired up on a toggle switch that turns both fans on at the same time. I bought a dakota Digital fan controller, just haven't installed it yet. But on my dakota I can run it up to 185 degrees and turn the fans on and in around 5 minutes the engine temp will drop down to 160 degrees.