When I purchased my 68 GS400 convertible, I did not verify 'numbers matching'. What all do I need to verify to determine that mine is a 'numbers matching' car? I cannot find any build sheets. The following is what I think I need to match? Then, how do I know that the numbers on the engine, tranny, and rear axle came with that car and not a 68 Skylark? I am planning to do a body-off restoration at the end of this year. - dashboard VIN (found) - cowl tag (found) - engine block numbers (cannot find) - transmittion stamp (found) - rear axle tag or stamp (cannot find) Do I need all these for a 'numbers matching'? What else do I need for a 'numbers matching'? Thank-you in advance!