Cooler line size

I'm considering doing a conversion from a 727 to an a500. The Mopar OD transmissions have 3/8 cooler lines, where the 3 speed tranny's are 5/16. The fittings in the radiator are still only 1/8 NPT.
Do I retain the 5/16 lines and just adapt up at the trans, or do I bend up 3/8" lines that would directly screw into the OD trans fittings, and then just adapt at the radiator, or do I have to get a radiator from something else that also have the larger fittings/ so as to not have a restriction...

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Author: volaredon