What sort of state was the old engine in the head came off? If the oil was in a bad state you could remove them all and soak them in brake cleaner/thinners something like that to clean out all the old oil. The you need to let them stand somewhere warm so all the cleaning fluid runs out, then give them a dip in some oil, re-fit and run the car up to temperature.

It may work, it may not, but you've got nothing to lose by trying it

At the same time you can check the faces of the lifters to see what state the cam is in, IF ANY ARE TIGHT/ROUGH LIFTING OUT DO NOT FORCE THEM UP.....