I got a mid-priced Ebay aluminum radiator for my '61. Fit was great, the construction (visible welds) and things like the radiator cap and drain plugs are all quality parts. It's been 5 years and I've been happy with it. I kept the original that sprung a leak in case I ever needed it but it will need to be repaired.
My dad went the Griffin and electric fan route in his '69 Camaro, he's been thrilled. It handles his 435hp 350 with aplomb.