Let me tell you what I went thru which was similar. When I went to register my 31 I had the title but the first words out of their mouth was "does it have the original motor and I laughed...maybe should have held off on that..
. I said no, I put a factory rebuilt motor in it. The original titles in 1931 went by the motor number. OK, things started to drift to sorry at that point. They handed me an affidavit to sign. On it, they wanted to know what the vin number was on the vehicle that the motor came out of. OK, at that point I was wondering what kind of daft individuals think I should know that...? I explained again that I purchased the motor from a factory and had all the paperwork, including the serial number they assign at the factory in cases like this and they called it a birth certificate. Several different papers and the actual plastic strip that was attached to the motor from the factory was viewed in person when they required me to bring the truck in on a trailer to look for themselves. That was on day two of this fiasco. And I blocked about 6 of there parking spots right in front of the office until I got done. I had to make a trip to the store that I ordered the motor thru to get more info...there was no more info available but the factory actually called them to explain that's the way it is... Well after all the hoops were jumped, I told the lady at the registration office to get her manager...we discussed it for a while before she gave in and oked the title. 3 days but done. What's really ignorant in my opinion, which matters not, I now drive a 1931 Ford 2 door with the title number matching a Chevrolet motor. Jeez I can hardly wait to see what that causes down the road with info like that...It's been 7 years, haven't been pulled over yet...