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 can be slow or thick headed at times so Just for the sake of clarity, the core support “opening” has actual radiator cores and fins filling it....top to bottom, side to side?