tips for repairing dent in door

sireland67 said
Make the back side of the door thicker, add a couple layers of fiberglass mat with resin to stiffen it up.

Fiberglass and metal do not mix. Adding fiberglass to metal is hack repair 101, and a sure sign of substandard work. Always. There's a right way to do it, and that's not it.

mbaird said
The whole chassis has been stripped so I am working with with bare metal.
I have two boards clamped on either side in an attempt to bring the memory back to the metal. I will apply some heat with a propane torch evenly accross the skin of the door.
I also considered tacking a metal bar inside the door skin as a reinforcement like the later models have. This is a 69 Swinger 340 car.... My 73 340 Sport had them from the factory... IIRC....

Propane torch and a wet rag should work just fine. Heat it with the torch, cool it with the wet rag, should shrink it up pretty well. You don't need the metal red hot either, just hot. And you shouldn't need to heat the whole door skin, just the area of the dent. If done correctly you shouldn't need anything behind it. Easier said than done of course, there's definitely skill to shrinking the metal the right amount.