Duane,
Good advice from Eric. I assume you got that # from your frame. It is not a complete #. Close but coded. Cadillac used the motor # to ID their cars for years. If your motor is original the # should be 3111281. That is the # you need to submit. The frame # was not matching until 1938. What you will get from the archives will be an invoice showing the dealer who ordered it & the factory installed options. It will NOT show the original buyers name.
HTH, Bob