Stock size oil pump, don't restrict oil flow to top UNLESS you have a full roller bearing rocker system-----and I doubt that you do-Erson out of business-----
If you don't have a block with NO oil to lifter galleys( early 58 fe and later HP solid tappet versions) you can use lifters with edm hole in bottom for lubing cam lobe and hollow pushrods to oil rocker arm end------

The FE family needs as much oil drain back to oil things as any engine out there and mods usually down grade that-the offset flow for about an inch or so in the headgasket area typically looooads up with sludge and blocks flow to the top.if you restrict the oil galleys at the top you will accelerate this blockage