Some of these ideas will likely be helpful on my f-161...oil pump comes to mind.
The oil pump I think is more of a 1950's thing than an "AMC" thing... heavy, overbuilt, simple, big fat clearances. Spending time on it is cheap reliability. Oil pressure at idle is "down" to 55 psi (250 miles) so I expect it to drop a bit more, but this indicates that the overall volume of the pump is way up.
I did check that the clearance at thrust at least doesn't jam the driven gear into the cover. If the gear thrusts back and forth in the housing, there will be X mils of clearance at the top or the bottom. Excess clearance == lost pump volume.
Your Willys motor, and mine, are in the same section of the Summit Racing catalog -- NOT FOUND :-) We gotta make our own parts!
