What radiator, and how much clearance from radiator to water pump pulley?
Are you running A/C too?
I just changed my Coronet from a Champion 4-core with Ford contour fans to a slightly thinner Griffin dual 1.25" core radiator with dual 13" Spal puller fans that are the "thin" 2" design for clearance these are rated at 1,250 cfm and 10-amps each. They are actually from Be Cool #75039, which had a rebate when I bought them and they come with mounting hardware which is an extra cost if ordering from Spal. If you have the clearance, the standard thickness (3.4") fan will pull more air (1,710 cfm.)
The fans are mounted diagonal across the radiator and cover most the radiator.
I made this change over the winter, and I don't have the suspension finished on the car to tell how these changes work.
I also have A/C and I may mount a 17" pusher in front of the A/C condenser wired to only come on with the A/C?
