Tranny pan gaskit

They do get bent. Go ahead and hammer any dents that came from outside in back out. Use a ball pien hammer to dimple the bolt holes outward slightly.
Lay the pan , gasket surface down, on a flat surface too check it. Your goal is to have the pans mating surface as flat as the trans mating surface.
I use the dimples at the bolt holes as a torque gauge. I tighten the bolts just enough to draw my dimple back to flat and no more.