in 1957 it ran at the Liege Rome Liege rallye, entrants Robert Reip and Reggie (Reginald?) Boven, number 102, license F-8854. It was yellow at the time, "la Petite Jaune"
According to a magazine clipping regarding "Retromobile" it was a 327.
from 2010 onwards it ran at the Mille Miglia in the hands of Massimo Ermini and Lapo Ermini.
According to a BMW press report(!) it is an BMW 328 coupe.
So, now it must have a 328 engine.
Tony A. is writing a book about the rallye, so he must have more info (but iI don't ask him)