The Englishtown show is at the drag race track in Englishtown New Jersey, I believe the track is called "Raceway Park".
The Carlisle show is in Carlisle. Pennsylvania. The spring show is all cars and parts, mostly classic through the 80's. Its the biggest fee market/swap show on the east coast if not in the nation. They say if you don't find it at the Carlisle spring or fall show, you can't get it.
They also have an all GM show later in the summer, if you want to travel, come to the all GM meet. No need to walk through acers of Mustand, Hudson, Packard and Model T parts. If you go, bring a two wheel shopping cart and be ready to walk your buns off.
One other place to look for sheet metal are the salvage yards out in the west lile New Mexico and Araizona. For floors and quarters, you may have to buy the whole car. When it comes to cutting major body parts, there is not much left to sell.
Good luck!