[LS short box]

Dewitt's get good reviews on the Corvette forums. I used a AFCO LS radiator on my 68 LS swap. Biggest I could fit.
Also I think Be Cool radiators are made in the US. Be Cool radiator on my current 80 Camaro LS3.
I've used Spal fans on all LS swaps. Never had a failure.

To A1971Blazer one of the things I did to clean up the upper radiator brackets I cut off the old fan shroud mounts. Just a suggestion.
See pic.