Although I am very interested in 6c2300s, 6c2300Bs, and 6c2500s, I am far from an technical expert. I have never owned one.
From the information I have, there is no difference between a 6c2300 and 6c2300B motor. The difference is that the 2300 had a solid rear axle and the 2300B had a swing axle rear end.
There are rumors that some of the motors used in the 6c2300B MMs were actually 2500cc, but I have no evidence.
As far as I am aware, no 6c2300 was built with a 3 carb manifold, but it is not that difficult to put the 6c2500 3 carb manifold on a 2300 engine. The increase in bore and the adaptation of the 3 carb manifold could have been done in the 40s or 50s by someone like Nardi.
The people that are the technical experts on 6c2300 and 6c2500s are: Fabio Calligaris and Gippo Salvetti
Their e-mails are:
fabio.calligaris@6c2500.org
and
enniosei@enniosei.it
The e-mail I have for Tito Anselmi, who wrote the 6c2500 book (there is, unfortunately, no book on 6c2300s) is:
tito@edizionipificio.it
Raoul San Georgi also knows a great deal about these cars. He is the one that "recreated" the 1939 Le Mans car based on 6c2500 parts that sold for something like a half-million dollars recently. His e-mail is:
sangiorgi@pandora.be
As to using the title Pescara or Mille Miglia for this 6c2300 motor number:
The 6c2300 with two carbs became known as the Pescara because it won that race.
The 6c2300B with two carbs is generally known as the Mille Miglia, because it won it's class in that race.
I'm not sure why Fusi calls both cars by the Pescara name. I believe the 6c2300B, with the swing axle rather than the solid axle was first built in 1936.
Some also say there is a Series 1 and a Series 2 6c2300B Mille Miglia, which makes the matter even more confusing.
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