340 with edelbrock heads overheating

You didn't mention it, I'm assuming you verified with an IR gun or some other method that you do actually have an overheat situation. How are you measuring temp.? Factory or aftermarket panel gauge?

Yes, a blown head gasket can pump hot air into the coolant system and not mix with the oil.
yes i used an ir gun and it did confirm its overheating. Its reads 220 or so at the thermostat housing and at either side of the intake manifold where the heads meet. . The radiator is working as the temperature in is much lower than it going out. I cant remember the number but it was significantly cooler.

heads are over 200 as well .