Spacer plate in front of leaf spring hanger

RustyRatRod said

It was probably hit on one of the front corners at some point and put the unibody into a "diamond". That piece was likely added to bring the rear end back square with an unsquare chassis. I bet if you have the unibody checked on a dedicated frame machine, you will find it is out.

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A torch and welding /riveting was the way the factory did it back then. The barracudas weren`t designed for a 4 speed to start with, "don`t know about the darts" Do some research, Jim Hale told me this back when I first started my fish. He should know , he`s probably had, built, bought and raced as many or more than anyone. From stockers to S/SAH cars, and owned at least one of the originals that I know of. jfyi.