The Milodon low-profile 8-quart pan is on my Roadrunner, also used one on a Duster.
I've never whacked an oil pan on anything except one time on the race car after a bumper-dragging wheelstand, and that car has a huge SS-style pan. I've never whacked headers on anything either, but none of my cars are as low as yours is; generally I run 1" minimum clearance to the bump stops.