Few questions on radiator tube size

KosmicKuda said

Original Mopar radiators are brass not copper. Brass is a copper/zinc alloy.
Brass conducts heat almost 50% poorer than aluminum.

Don't beat me up. Above is from pg 55 of current Mopar Action magazine, June 2021.
You'll do fine with either 1" or 1-1/4" tubes but as already mentioned, pay attention to core thickness.

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I guarantee that the radiator cores are copper... tanks may be copper/brass alloy. Copper cools better than aluminum but some aluminum radiators have a different design that may make the equal to copper/brass.

An old fashioned copper fin and plate design radiator will out cool any other radiator design regardless of the material. That's what Peterbilt used in their 379 models that I owned.

I had one of those plate radiators from a Lincoln in an early latemodel stock car and it was a chore to get that 427 up past 160 degrees in a 50 lap race.

I think an aluminum radiator in a vintage car looks out of place and most don't cool as well.