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About 450 HP. It's a mild build a bit above stock. I live in the desert, and during the summer, it got warm sitting but never overheated. Call Cool Craft and see what they say. I would go with a 26-inch if you can fit it. Bigger is probably better when it comes to radiators and high HP big blocks.

440. Stock plus a 509 cam. Electric fan. Plymouth GTX, 1966-69 V8 383/426/440 22 Inch Wide Aluminum Radiator - Cool Craft

I got a 22 inch aluminum from Cool Craft/US Radiator. Works great.