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The Helicoil should work if you can get the tap deep enough. Helicoil taps work like any other tap, the ones normally available are starting taps, fine foe through holes. This fitting is a blind hole so you may need a bottoming tap. These have only 2 of the first threads tapered instead of 6...

Copper on aluminum will cause corrosion in the aluminum when it gets wet. Or even humid.

Great info ssdvc! With a new radiator, new rubber mounts are a good idea. Prothane makes urethane copies. This minimizes electrolysis which is the prime cause of aluminum failure.

Looks like an o ring type fitting. Should be a standard part but I don't know the size. Surplus Center has good tech info on fittings. https://www.surpluscenter.com In the technical section. If you have a thread checker, 90% of the guess work is done.