360 Over heating

Ditto on baffles so air goes through versus around the rad.

If it was intended to be a "puller"/behind the rad, did you change the fan polarity (flip red and black on the fan motor) to run it as a "pusher"? If not, the fan is working against you. What is the part number for the fan and where did you get it?
The fan does not need to be centered, so you may be able to offset enough to get clearance to run it behind the rad. You would be better off with a higher output/amp draw but smaller, thicker fan or engine direct driven flex fan (not aluminum blades that will let go, but thin stainless) and a spacer to get it close if no shroud and provide alternator clearance to the blades at high pitch/low rpm. It does not need to be a rigid oem fan with a clutch hub. The blades flatten out as the rpm increases.