1972 340: engine oil smells like gas

Sounds like its not getting up to temp and not being able to evaporate the gas vapors. That, or your dumping fuel past the rings. I once read that if a car is going to sit, its best to change the oil and let it sit, than to keep starting it and only letting it run a few minutes. It contaminates the oil and doesn't get up to temp to burn off the vapors of fuel and moisture that accumulates.