Might be more efficient to reverse cooling flow through the engine than duct it through the wheel wells, say perhaps with an underbody engine scoop. Couple of standard vent boxes joined at the fan inlet, couple of circumference vents on the doghouse ducting to the exit hole......
I believe you know the redline was supposedly 3600 rpm and everything was based on that. Porsches, being a later variant could spin much faster have different numbers. The bug street racers I knew were getting a reliable (?) 300 horse at 6 grand which would have floated stocker valves into the pistons.
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