Hello again to all. After installing my rebuilt 383 in my 66-300 it took quite a while before I could get her started. Bad starter relay, fuel pump among other of murphys gremlins conspired against me but today was the day she finally fired. I let her run at the suggested RPM range to break in the cam and the POR paint I used on the manifolds seemed to burn in nicely. Now my question is this. What is the normal operating temperature for the 383? The car initially had only an idiot light but I opted for a temp gauge insted of the light. For todays running it keept creeping until around 230 then seemed to stay there. No coolant leaks and am just using standard pre mixed 50/50 anti freeze. I am just curious what a normal temp range can be expected.