Mikey,
I had the aluminum radiator ready to go, all adapters/mods done and I managed to strip out the bottom oil cooler bung. I boxed her up and put the unit up for now. I will, after I have my truck completely sorted, get the aluminum radiator repaired (helicoil the bung) and either sell it or keep it as a spare.
That said, NAPA had a new one (for $1800) located in New Jersey, but no one else could find one. The rebuild was $950, with brass and copper, and I am VERY happy with that, given the alternatives. You maybe able to find a used core in a junkyard and get it rebuilt.