I put a champion all aluminum radiator in my 72 Blazer. You can pick up a 3 core off Ebay for about $200 or $250 for a 4 core. They were out of 4's when I got mine and had to settle for a 3 core. The only reason I wanted 4 is I'm running a 468BB and wanted all the cooling I could get. The mistake I made was adding 2 12" electric fans right to the radiator without a shroud. Cooled fine while moving, but overheats when sitting still.....That's my project for this week. Cut out some aluminum on a waterjet and making a new shroud with 2 16" electrics. Might look a bit rough, but it's tough to fit 2 16" circles in a space that's 17"x29".
Old setup:
[IMG]
[/IMG]
New shroud:
