340 with edelbrock heads overheating

That sucks to hear. My 1008 needed a retorque after a few heat cycles. They would lightly weep coolant on both sides after warning the engine up. No other leaks. It happened out of the blue after driving the new motor 6-7 times. I've never had to re-torque the head bolts but read it not uncommon sometimes with aluminum heads.

Are you using bolts or studs?
Edelbrock recommends retorquing after a heat cycle.