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If you look back at some of the General’s hottest-performance cars, you will notice a reoccurring theme — many do not have a traditional perimeter frame. Many of these muscle cars were built on what is called a unibody platform. Camaros, Novas, and Firebirds were all built with a unibody construction utilizing a front subframe section that attached to the body, rather than full perimeter frames where the body is mounted onto the frame structure.
This was okay when the cars were new and factory stock. But, age and the addition of a few major performance enhancements, will help you soon notice how inadequate a “seasoned” unibody-constructed car really is when diving into building a true performance classic.