Best place to buy a radiator for 86 C-10

[runningiron]

Need some advise where to get the best buy on a heavy duty radiator for hot climate. We live in between Phoenix and Tucson, Az. where it gets super hot in the summertime. I'm helping my grandson put a 350 SBC in his 1986 C-10. It came with a 305, has a puny 2 core radiator in it now, an automatic trans, AC, PS. I'd like some input from the AZ, NM, desert dweller folks that have bought HD radiators or aluminum radiators, which works the best for you, and where are the bargains? Thanks in advance for your responses.