Don't assume you can just take the frame number, stamp the engine, and all is well. A friend had a copy of the original title clearly showing it matched the 1931 number on his frame. However the engine had a '29 number which matched the current title. So, the frame number was stamped on the engine and a corrected title was applied for. Thinking everything was in order, about a year later, he got a call from the DMV. His original number was in use already so he was told to either accept an assigned number from the DMV for the current year or find another engine with an original stamping that no one else had registered. Apparently, his original engine ended up in someone else's Model A and was "corrected" to that car. Ironically, the Model A in question was bought 400+ miles away in another state, yet the A with the other A's engine was only 30 miles away!