Vintage Mustangs are unibody cars which means that they don’t have a full frame - on the track, the bodies of these old cars can flex a lot. I purchased Global West tubular subframe connectors which run down the middle of the car under the floorpan and connect the front and rear chassis rails. To prevent wheel hop, I sourced traction bars as used on the early Shelby Mustangs. Both the subframe connectors and traction bars are tacked in place when the car is on the ground and then the car is raised on stands for final welding.
To prepare the car for the installation of sub-frame connectors and traction bars, I had to have it sitting at the correct ride height. I installed lowering blocks on the rear leaf springs and cut the front springs several times until it was sitting close to the way I wanted it.
This is how I drove to the track - the rear race tires and my tools were in the trunk and the front tires filled up the passenger side.