The metal is distorted due to over torquing of the pan bolts. It's common practice to work it flat by placing flange down on a hard flat surface and using a hardwood block as a drift for a hammer. Cut a block the correct thickness, move it along the flange as you tap away at it. You won't have to hit it hard. A little patience and finesse will get it back into shape.
These pans leaked badly at the gasket surface. Lots of guys don't use gaskets anymore- they use RTV sealants instead. As thin a bead as possible. And less torque on the bolts to keep the flange from distorting. I like to use a thin rubber gasket (shop around) and a thin bead of RTV on both edges.
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