Overheating 360 new engine
I wonder if any of this is helping the OP. I'm guessing not.
It seems OP is in Florida and it may be some time before we hear anything.
OP has an electric fan and no room to fit a mechanical clutch fan
unless he dumps his 'March' pulley system. He most likely will not dump the $$$$ invested in his March pulleys.
So its beating a dead horse by some that keep going on and on and on with Mechanical Fan comments.
Other comments about the mechanical conditions inside his engine are still good. Valve adjustments, Piston ring gap butting, Core shift and the overbore too close to water jacket, Plugged or rusted water passages, oil pressure not good causing bearings to overheat......
OP is a former ASE mechanic so most of the comments about Electrical Fans should help when he can get back to it.