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looks to be a back half/ladder/4-link car why would one go through the trouble an install a Pontiac/olds rear is beyond me

The title of the video lists the car as a Monza, which puts it likely late 70s, early 80s body. Plus, the under chassis shot of this car appears to be a pretty old 2x3 rectangular tube piece. Been a long time since people mounted shocks that way. At one time the Olds rears were very popular. Betting the car was built a long time ago

Monte