360 Advice Needed - Autocross / Street Engine Build

It's a brand new Spectra CU526 rad though, that should be clear and free flowing.
I agree though, the lower tank should be cooler than 9° from the upper tank.

It's the 5 blade mechanical fan, with the Hayden viscous clutch.
The clutch is spaced about 3/4" from the rad fins, and the fan sits about 1-1/2" back.