Hey guys, I have $500 credit that I'd like to spend on a new rad, since mines rotted out thanks to acidic coolant being left in there for three years.
The online GM website is absolutely useless for an oddball query like this, as are all the Google searches that I've done.
So whats the best rad possible from GM that would work with our cars, I'm not too worried about a little modification to make it fit. I'd like to replace the stock 305 with a decent crate engine, so I need a high capacity one, as my car already comes with the dual fan housing.

Big thanks well in advance.
(BTW, the guys at the dealership couldn't help me when I asked, all they could recommend was a new OEM one)