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I had to space the windage tray off the main caps to clear the connecting rods. The oil pan and oil pump pick up tube fit just fine with my 4" stroke crank.
If this is a F-body pan, most of the time you do have to grind the pan. Just the front little notch. You will also need to put some washers under the tray to space it down. Normally 2-3 flat washers will work.