Thanks Bob. I'll try the thermostat first.
Mike, the heads are Edelbrock 60899 performer RPM heads for 262-400 up to 1986 so they are correct.
One thing that did bother me though was the fact that the felpro gaskets had such small coolant holes between the center cylinders. Edelbrock and felpro said that was ok and was there to even out hot spots the center cylinders.
I'll pull the thermostat this morning and try another one.
Thanks for the input guys.
Heck I was just trying to take it to the muffler shop. Guess I'll have to drive it on open headers one more time for the neighbors.
