Marcos Maniacs

Hello again,
   After receiving the build history of my Marcos back from Rory, it didn't
have any history on the engine/running gear numbers. With my other special
cars that I've had in the past (innocenti, siata, bond) the manufacturer of
the engine usually had a unique way of identifying or setting aside the
running gear numbers that they sent to the car manufacturer. Did
Ford/Volvo/Triumph etc. do that with the running gears that they sent to
Marcos? Or did Marcos make any special marks or numbers on the running gear?
Basically, how would any of us tell that we had the original running gear?
Thanks,
Dano
3M/5463