(1) If you haven’t removed the valve covers, why do you think it’s oil-starved on the top end? Is it knocking?
(2) What’s the problem with removing the valve covers?
What does the oil look like on the dip stick?
If a fresh build even though sitting it should look clean.
If not change oil and filter> Does it have an oil pressure gauge? Unless you are in A warm climate that oil is cold and will need warm time. Let it idle for ten mins and then raise rpms. If top end is starved lifters will tap! Other than that it pop the covers and have a look see!