Some have used the coolant lines from the back to front to help reduce the heat load in the back of the heads. What if I made a thermostat housing for each of the 4 exits in the heads, then plumbed them to the radiator?

If you used a '92-'96 crossover and modified the lid I could see it working.

I was thinking bout maybe trying to use another cross-over, with a T-Stat, on the back ports and then connecting the hoses. Clearance might be a problem but maybe not