I went round and round on these oiling mods when I built my 360.
FWIW, the owner of Bulltear, who presumably knows AMC engines as well as anyone, told me the lifter galley bypass mod was a myth. The most common version of the mod involves restricting the flow on the galley that's opposite the bypass, in order to create enough pressure to push oil thru the bypass tube. He said that could create more problems then it eliminates.
I had the bypass mod all set up, albeit in copper
. After speaking with Bulltear, I tore it out and plugged the holes. I also abandoned the little timing chain-pisser mod that is recommended in some literature.
In the end, the oiling mods I did were: Open up the main passageway from the pump, gasket match the ports, Gyptol the heads and block, and grind the casting imperfections on the drain holes . My operating pressure is consistently around 50 psi, and 20-25 psi at idle.