I just got done going thru a similar situation at my DMV.
I went in to the DMV to get a car in my name....the original title from Michigan didnt have mileage printed on the title, but instead had a block for the previous owner to annotate the mileage when the car was sold. The car is an original 70 340 4 speed Convertible with 81,000 some odd miles on it....
The first lady at the DMV(Department of Motor Vehicles) that helped me wanted to put the mileage as unknown....I stopped her as the block on the previous title stated 81K (written in by the previous owner) on it....she told me that it was standard since the previous title didnt have it annotated on the title from Michigan's DOT, then they could not put it on the new title as such....I pleaded with her and stated that by doing this, she is changing a known mileage to an unknown on a classic car and potentially hurting the resale of the car! She told me that there was nothing that she could do about it....I asked for the previous title back from her and proceeded to the manager.
No luck here either! The manager stated that since I could not verify that the engine was the original motor, she couldn't do anything about it....I asked her about a car thats 10 years old then that has its motor replaced...."Can I roll back the odomoter then since the motor is then a new motor....She didnt like my example.... So I left the DMV upset to say the least!
Next day: After doing some thinking on it, I decided to press on with it and let them "ruin" my title and the authenticity of the original mileage. I walked into the DMV, got a number....hadnt even sat down and my number was called! WOW, service is quick today I thought....I got to go to a different lady at the counter and low and behold....she didnt make the mileage a issue and placed the original mileage on the title as its supposed to be! No questions asked! I dodged that bullet! WHEW!