With 408 CID and 450 HP, I think you are gonna need all the high tech al. radiator (translates to expensive) you can get.
I barely get by with a 4 row brass radiator in my '66 with a 335 HP 306, Edelbrock water pump, Shelby front valance, and an auxillary electric pusher fan in addition to a mechanically driven 5 bladed flex fan.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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