Our Muscle Car Of The Week from the Brothers Collection is a 1970 Chevrolet Chevelle, built with the SS performance and styling package.    The Chevelle was the midsize Chevrolet family car, and the SS option added a long list of performance upgrades in the driveline and suspension departments.  Ours was also built with the Regular Production Option code LS-6, the high-compression big-dog 454 cubic inch V8.   Could this be the very last 1970 Chevelle SS LS-6 454 ever built?