Thank you for your reply and the pics of the build sheets. Regarding 07577, I may be wrong, but doesn't "in acciaio tipo alluminio" mean steel type aluminium or aluminium type steel, meaning it does actually have an aluminium body? The short nose alloy Competizione Clienti cars do not have the roof seam. I have read that apart from the Competizione Clienti cars, the alloy body option for the 275 GTB road cars was introduced on the long nose, so an alloy bodied short nose standard non comp. road 275 GTB was never made??? Unlike the long nose 275 GTB/C, which had dry sumped 275 LM spec engines (with 3 unique Webers), the engines in the Competizione Clienti cars were standard wet sumped road engines, but with the 6 rather than 3 double choke Webers, so a 3 carb 275 GTB engine would presumably make even less than the 240 bhp of 07447?