Filling the internal volume of the lifter with oil prior to install is not nessessary
And can make it real hard to adjust the lifter preload correctly.
Can end up with a locked up lifter plunger and no cylinder compression
The lifters fill all by them selfs very quickly on engine start up.
Just coat the foot with moly paste oil up the rest of it and drop them in.
Be sure to oil up the rocker arms too.
Dipping the roller wheel end of roller lifters in oil and letting the oil soak in to the roller bearing is good stuff but filling the internal cavity in the lifter is not.
You can soak your roller rocker arms in oil to your hearts content.