As I mentioned in previous discussions, VELOCITY is a key component of the cooling system, including the SPECIFIC HEAT CHARACTERISTICS OF the cooling medium.
A good velocity (circulation) is 15-20 ft/second which entails the use of the 8 blade mopar pump or a shrouded inlet pump such as Flow Cooler design. Try to determine the GALLONS/MINUTE of the pump, the more the better.
SPECIFIC HEAT refers to the coolant's ability to absorb (in the engine) and release heat (in the radiator) the heat collected.
Also the CHEMISTRY of the coolant (ethylene glycol, propylene glycol, water, and a water wetter [a surfactant]), and the system's operating pressure also influences the efficiency of the cooling system. Also remember that the FINS in the radiator (not the number of tubes) are the heat exchanger surface and should be maximized. Ideally, the best material of construction and the methodology of construction is the one variable that the owner must choose. Just my opinion of course.