Overheating 360 new engine

Uneven exhaust temps are normal, center cyls are always hotter on a small block with stock type cylinder heads. With the cooling issue, you have painted yourself into a corner with your modified cooling system. Some of the above responses are true, some are not. I would never have gone in the direction, or the way that you wanted your engine bay to look, but it's yours, I get it. Now you have found out how incompatible aftermarket parts can be. Your going to spend more money now. You wouldn't want to go with my route, you would be starting over.
Not unusual to blow a freeze plug out either.
Sorry, I can't help you.
Good luck

I haven't seen where he's listed what size radiator he has, but if he has a 26" radiator and at least 3.5" from the back of the radiator to his pulley's he can get out of this for around $160. Pretty sure the Holley Sniper set up he has will control the fans and he already has a way to send power to the electric fans.

Dorman 620-104 Dorman Electric Fans | Summit Racing

The '95-2000 Ford Contour set up is only about 3.5" deep at it's widest point, which is to the back of the motors. The rest of the shroud is about 3". With my 3 core Champion 26" radiator and the Contour fans the back of the fan motor is about 6" from the radiator support. I have a March serpentine pulley set up but I'm only running 3 pulleys so it may depends on where the motors sit with his pulleys.

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Now, if he has a 22" radiator then he could look for a Ford Taurus, Chevy HHR, or a Mercedes single fan set up. All of which can move enough air for his set up, the only question on some of them would be clearance based on where the back of the fan motor is. There are threads on FABO on all of those fans being used by other members.