Overheating 360 new engine
I've read the whole thread and there is lots of good info and agree with the post above, #93. There are too many unknowns from the OP. Seems he has the timing right. He needs to find out the CFM rating of his fans. There is no temp change when the car is moving and he doesn't have room for a stock setup.
I'm thinking he also has a lean condition on some cylinders. I had an overheating issue on my 340 sixpack (six corner idle) when I first got it. I replaced the thermostat, clutch fan and added a shroud and checked the timing with no change. It ended up probably being a lean condition on the rear carb which is near impossible to adjust on the car. A mixture screw was jammed fully seated in it. I changed the baseplate to a Promaxx one to cure my issue.
Hopefully he is okay at his location in Florida.