340 Duster oil looks milky

If the oil hasn't emulsified with whatever may be in the pan it will stratify...separate...and as oil is lighter than water or coolant mixture or whatever might be in there, however small the amount, the oil on the dipstick will look better over time if the engine hasn't been run. The coolant level wouldn't change if it hasn't been run. No pressure or flow if you're thinking head gasket, especially if it's very small.
Is that a newly rebuilt engine that's been broken in?
Welcome...BTW
I bought it from a old Mopar guy and he said the cam, timing chain set etc was new but it set for over a year in a garage with no plugs in it. I took a gamble and got it anyway. I filled it all the way with coolant then started it and after 5 minutes realized something wasn’t right so I checked all fluids, the coolant level looked the same. It had new fel pro gaskets installed but like I said it set for over a year with no oil or plugs in it