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Good point. The hemis used the 1/2 pipe thread, wedges used the 3/8...the boss on the wedge engine is not as big so tapping to the larger size is a little tricky (use a tapered reamer first!!!). NPSH is an issue at high RPM but not at idle. Most hi volume pumps are a crutch for poor clearances...

Oops 354 hemi, don’t shoot the messenger.

Part duex , If the engine has full grooved main bearing, stock was half groove, and large rod side clearance (radius fillet as opposed to grooved crank), then expect a 10 psi drop at idle. Early mopar engines 352/392 hemis all used full grooved mains, the modern, LA, RB,R engines all used 1/2...

2 issues not mentioned, sticking pressure relief valve in the oil pump, air leak in the pick up tube connection (block pipe thread, or pickup screen). Oil pressure seems erratic. Remove the pump, check the relief valve. Even a fleck of metal will stick a relief valve, DO NOT radius the cut outs...