Sorry to bombard you guys with so many questions. I think I have one in just about every section.
Sent radiator out to get redone and they are telling me it's old and rotted and needs replaced . So I'm finding out the GMCs are diff then Chevys and as such harder to find.

So far I have found
US radiator -- aluminum 2 large cores for $405
Jim Carter -- copper 4 row for $440

Anything else out there ?
What do you guys recommend aluminum or copper ?
Staying with the ole 6 for now but some day who knows and don't wanna buy twice.

Thanks.