Overheating -- Corrective measure questions.

I originally bought the radiator for use on a run stand. I just happened to try it and i squeezed it in there. You can see that there is a 3-4 inch gap under radiator where air passes around and the top 4 inches are blocked by the core support. The trans cooler will be relocated. I need a properly fitted radiator If I expect it to work.
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I cut the mounting flanges off and had 1 1/2'' angle welded on the sides to get the rad. fush w/ the cradle .