[mhsprecher]

Interesting hypothetical question.

I think legally it could go to either, but I think an argument could be made that it goes with the chassis. The chassis mark would correspond to the dash VIN on modern cars. It was easier to read the SN on the engine than the frame. The counter argument could be that it is the motor because in Model T days, the number was on the motor only and later put on the frame.

Does the title mention body style? If it does, then the frame/body is the answer, but I think this is an unanswerable question.