I've found a few good posts about new radiators, and one's that require min fab to get a new/better one in. Lots of the posts are years and years old, some the part numbers are no longer available.
Current radiator is not flowing, and from past experience it could get $$$ to flush and fix any issues and some of the aftermarket aluminum one's i've seen in approx the same size are in the $200 range.
It's going for my 76 cos with a very mildly built 122 motor, so no need for a hugh HP beast of a radiator.
Car has been parked for 30 or so years and it's ready to roll when i get the cooling issue taken care of.