I had a 1979 F12, Perkins 4.108 diesel engine. Earlier gas versions had a single-carb 1300 and single-carb 1600, far as I know. The transaxle is Alfa-made, has 101 part-number parts inside, including synchros, but not much else is common with other Alfas. I don't know if earlier version had a different transmission.
Brake calipers front were four-piston ATE, similar to BMW 3.0 and some Mercedes. Brake master cylinder had a Giulia TI part number. Clutch hydraulics were I think same as 1750 Berlina, but longer hose. Rear brakes were drum, never had them apart.
A guy in the Bay Area bought my F12, but I haven't heard from him lately.