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If you're talking about the factory style pickup there's no advantage to having a clearance under it, even with the pickup contacting the pan the channel that feeds the opening is larger than the opening so there is no restriction.

Aftermarket pickups like the Milodon must have clearance.



Correct. Factory style can touch. Plenty of area for the oil to access the tube.

If it is aftermarket, not only should you have clearance, but add a positive spacer between the PU and pan to make sure that the pan does not get sucked up to the PU.