Fix 66 Cuda fender

I'd look for another fender but if you really wanted to fix it:

You work it out the opposite of how it went in, like 68-340 said from the outside working around towards the midlle. The metal is stretched and you are going to shrink it back. If you just start banging away at the3 highest point you'll have a bigger mess than you started with. Further to that, you use the dolly to support the metal just beside where you are hammering, you don't hammer on the dolly, that will just further stretch the metal. Take it slow, you don't have to hammer very hard, just keep working it slowly around towards the center. If you use a stud gun, it's the same principal, you start pulling from the outside edges moving slowly towards the deepest part of the dent.