I appreciate it guys.
The coolant is flashing off somewhere as the oil reservoir at this point still shows good oil / high level but clean so far. The milky film is interesting / thick enough to block out the green coolant, but thin layer. No froth on the valve train / rockers, in sump.... I will look more.
I've got a thermostat in my box of replacement parts.
I am going to take off most of the Emissions equipment and eliminate hoses that aren't needed. Clean up the vacuum hoses. I will check the carburetor bolts.
The rear main leak isn't bad. But if I do price out the parts and its ***$, when is it worth it for a rebuild / replace? I've had my 73 charger 318 for decades. It leaks. As long as its a slow leak I'm good.
I actually bought the car in van nuys / North Hollywood