Craig---I too am a design engineer, and have been building hotrods for close to 40 years. You will not find drawings like you are talking about----anywhere!!! There may have been proper engineering drawings of all autoparts at one time, but they were all propietary, and never released to the public. The only drawings available are "envelope" drawings of components giving maximum overall sizes that are put out by aftermarket parts suppliers, but nothing that you could incorporate into a design drawing. Get out your tape measure and join the rest of us.