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FWIW, I did a couple hours of research on Rockauto, using the original radiator dimensions for my car (1981 Trans Am), and comparing it to the various radiators on later Chevy cars and trucks. I think the best cheap and light weight radiator was from a mini van with a heavy duty tow package. It had an oil cooler and trans cooler in addition to two .75 inch cores. I saw some radiators with two 1.25 inch cores, but those didn't fit my car. The one I got was $109, delivered and warrantied. It has one 1.25" core, and even with just 2/3 of it covered by a fan, keeps my engine at or below 200 degrees.
__________________ Karl R. - Editor, Silver Blade Magazine
2008 Grand Prix GXP | 1981 Trans Am WS6 - LS1, TDP Prepped C5 T56, Edelbrock Thunder AVS 850 carb + Performer intake + LTH, ACT Flywheel, Spec 2+ clutch w/ alum. pressure plate, Global West LCA UCA and springs, QA1 DA shocks, Hotchkis handlbars, Wilwood 6P brakes in front, LS1 4th gen brakes in back, 3.42 8.5"10 bolt with Moser 30-spline axles and Detroit TrueTrac, full cage, aluminum DS, lexan glass, Braille 2015 + other bits of gearhead joy.