Woody,
You can drop the pan by raising the engine, drop the pan down, reach in and remove the oil pump bolts, let the oil pump drop into the pan, position the crank throws so the pan will clear when you move it forward. It's not easy but can be done.
I can't figure out why you are having this problem as the oil pump and pick up are pretty much standard. Unless you have a different pan from the standard 390 your set up should work.
Good luck,
Joe
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Joe DV
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