I worked at P.V.Speed (Malden,MA) from 1979 to the early 90's. Between us and New England Speed we were the big guys in the area. There were a few V8 Vegas around with either Hooker or Don Hardy kits but no Motion cars that I can remember. A buddy of mine had an orange GT wagon with a Hooker kit and a Motion set up 12 Bolt ladder bar rear but the car was so rusty and poorly set up he broke it almost weekly. I don't remember a Juniors shop but may have been someones name running it.
