tips for repairing dent in door

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....