the factory lifters are from INA too. They do come prelubed and pumped, just drop in and install the cam.
on my 606 engine - having 24 of these lifters I redid them by rebuilding them carefully and using mobil1 0w40 in them - there was quite some buildup in the cylinder cavities of the lifters.
you are right abt the asking for trouble part for the OP. I have seen countless mechanics literally fracture/crack the valve guides while trying to set the valve clearances.