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Hi Pitt Gas may be old in the tank or new gas mixed with old gas.
Oil may be very old containing water or gas residues from previous floodings
Spark plugs may be old and causes bad combustion fumes
Check temperature after warmup to assure that it has a thermostat
If it was sitting from long time few valves may be stuck My suggestions are: Be sure you have all new gas (super for now) in the tank
Change the oil and filter put non detergent oil (for now)
Change the spark plugs and spark plugs wires
Change points and condenser
After these changes run the engine for minimum one hour and see if the temp gauge indicates normal temperature. After that you may take compression test. Water condensation in engine and exhaust system mixed with bad combustion byproducts caused by one or all previous statements may produce lookalike oil at the exhaust. I think that a serious engine evaluation cannot be made just by running the engine for few minutes. An ("apparently") worn engine gives sometimes good surprizes. Anyway if the engine is realy worn and needs rebuilt only the oil is not recuperable you will be able to reuse points plugs thermostat etc. As usual cheaper tries first.... Good luck ! Joe Ferguson
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