Swap from LA 273 to magnum 408 water pump and cooling

Hi everyone,
Quick group of questions.. I imagine you guys and gals may know.

When switching from the LA 273 over to the 408 magnum, is it recommended to use the old LA style waterpump and radiator (this is prefered, as I like the old school look) and would like to keep the current radiator if possible, however I do want to run aftermarket AC.

Reuse old radiator?
Use 1965 barracuda style water pump? (new of course)

Thank you