If you aren't concerned with original looks, go cross flow, and as big as you can fit. I installed a Griffin "Musclecar series" '68 big block radiator in the car below (using a '67 radiator support & mounting hardware). Not much room for a fan with the serpentine setup. There is info on this, and the electric fan shroud setup I installed, on the wesite in the signature.
Good luck!
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Here's a pick of a Northern Radiator I bought off summit in my 68. I believe is measure 31 inches wide but it fits nicely between the frame rails.
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