When I was looking for a rad recently, read something about 2 vs 3 row... the 2 row have larger openings and actually flow better than the small opening 3 rows. I'm no expert on it, but I would think a bigger core would be better than thinking 3 row over 2 and such.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram