Turning torque for engine

What pistons are in it?
If KB107s, the catalog numbers for skirt clearance and ring-gap factor, IMO are too tight.
If you test the turning torque, do it cold AND hot. If the pistons swell up or the rings get to butting, it will only show up on a hot engine.
Just So you know;
I also have a bored out 360 with Edelbrock heads, and KB 107s. The Compression ratio is currently 10.95 but has run to 11.3, with no problems.
Like you, I had an incurable overheat.
I finally took the engine apart, and loosened her up.
Going from memory;
the skirt clearance was set to around .0035/.0040 and the gaps to
~.034 top, ~.028 second, and oil IDK. After warm up, the Thermostatic Clutch keeps her dead on 205>207, never less nor more, on a 195stat.

Good luck to you as I remember how frustrating that summer was.