1978 Chevy 3/4 ton - need help with radiator/fan shroud

[Nick_R_23]

Hey guys, I have a 1978 Chevy 3/4 ton that I'm getting prepped to do an LS swap on, but I think I have a few mismatched parts on the truck. Actually, I know I do because my dad told me he had scavenged whatever junkyard parts he could to make it run - back in the 80's! The problem is, I'm not sure what is correct with the radiator and fan shroud. I know there were quite a few different styles and sizes of radiators and shrouds in the 70's trucks.

The stock radiator is junk and I'm planning on buying a replacement from either Napa or Oreilly's...the problem is they list about 10 different radiators, and none seem the same as what I have. Can someone here who knows a little more about these 70's square bodies tell me what I have, or should have in here?