Not Ranked
There is a new system of frame stiffeners for the early Mustangs that I read about in one of the car magazines. It looked like a double plate tied into the frame rails, rocker panels and torque boxes. You should definately look into it or some type of frame reinforcement for this application, especially with the price of these fastbacks going up all the time. Sorry I couldn't find the reference for you, maybe someone else here knows about it.
mannyjoe
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