I guess “best” can be subjective. I just replaced the radiator in my 71 Jimmy outfitted according to your description. I’m old school and didn’t even consider aluminum. I went with this one from Speedway and am happy with it so far. My only concern is the copper cooling fins. They are definitely thinner and lighter, and bend more easily than the old non-Harrison it replaced.
https://www.speedwaymotors.com/1967-72-GM-Truck-and-Blazer-4-Row-Radiator-OEM-Replacement,73785.html
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