In order to fit a Ford motor into a car for which it was never designed, I have reversed the sump, ditched the internal oil pump and fitted an external gear pump. In the US Peterson manufacture a remote oil pressure regulator for use in Nascar and other motor sports useing dry sump set ups but as I am in Australia I cannot buy a remote regulator and so I have machined one up and have used the spring and poppet from the original Ford oil pump and made it adjustable. In the Ford oil pump the leakage past the poppet flows to the pump inlet, is this the best place for me to plumb this too or is it better to run it to the rocker cover or the sump. My concern is the oil above the poppet may restrict the sudden movement of the poppet and may be affected by vacuum pressures in the suction line.
"In the Ford oil pump the leakage past the poppet flows to the pump inlet,"....... This is fine as long as you know the oil that is vented will not build up in the line and will flow freely back to the inlet, but this could be a problem with any of the arrangements that you mention.....it all depends on the location of the pump.
I would be tempted to relieve the vented oil thru the rocker cover.
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