I just go a 4 row 22" radiator from US Radiator for use with a 5.9 Magnum in a '68 A-body. I opted for the standard core design, but they have several other versions to get rid of even more heat. It's a nice radiator, looks factory and the price delivered was less than $550. Even without a shroud, it's almost too much radiator already.

1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)