I have a 572 Hemi, 11:1 compression decent solid roller street engine. I have had various types of aftermarket aluminum and copper/brass radiators along with many aftermarket electric and belt driven fans and believe it or not my best cooling package as of now is a 26" Glen ray max cool radiator, stock fan/shroud and thermostatic viscous clutch. Basically stock appearing stuff. I also have a Flowkooler water pump in the typical aluminum housing. All of the belts and pullies are standard sized for a 1970 RB/wedge equipped challenger.
AG