You can register with the serial number of the motor, but:

Vehicles registered under this section shall not be used for general transportation purposes, including but not limited to daily travel to and from the owner's place of employment, but shall only be used (i) for participation in hobbyist vehicle exhibits and similar limited-use events and (ii) on the highways of the Commonwealth for the purpose of testing their operation, obtaining repairs or maintenance, and transportation to and from events as described in this subsection.

So you could possibly be allowed to drive to and from the meets, but not much more than that.