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I used Murray on my Diesel... from O'Reilly's It was Copper..I got an aluminum one from the local radiaor shop for my R10 when it had the 305, Aluminum with plastic tanks. $150....
i got one for my cavalier at Advance auto. i think it's a Dorman brand and has held up just fine.Unfortunately, i don't think gm/Ac delco no longer makes a radiator for the 73-87's. i'm not sure if Delphi is/was still part of gm but i think they carry a part #. 24566394 That is for an 83, but i would imagine it would also fit at 78 or they also carry a part # for it.