64-66 Radiator

[65Custom]

Hello all, wondering if anyone makes a cross flow radiator for the 64-66 trucks,
I'm planning to put a big block in my truck and a cross flow radiator is better cooling than a down flow radiator. So in my searches for a radiator I am not finding anything to convert a down flow to a cross flow for these trucks,

Has anyone done this conversion? What did you use? Or Am I just stuck with a down flow from one of the many suppliers?

Thanks in advance