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Almost all 101/105/115 gearboxes have ratios of 3.30, 1.99, 1.35, 1.00 (4th) and 0.79. The 1300 cc cars that had 5-speed boxes (Giulia TI, GT Jr, Jr.Z) had a 0.86 for 5th. There are some boxes with close ration gears but they both very rare and very expensive.

The older boxes, 101 boxes, had what were called “Porsche” synchros. These are easy to spot because the synchro rings are grooved rather than being sintered. These old synchros need Shell Dentax oil in order to shift smoothly. It seems the newer oils are too slippery. Shell Dentax is hard to find but then so are the old synchros.

Most of the boxes will bolt up to most of the bell housings but a good safe bet is to stick with the bell housing your car came with. This will minimize issues with clutch actuation.

One thing to note is that the newer bell housing sealed in the shift rods. The older ones had o-rings sealing the rods. The o-rings usually don’t seem to get replaced when the boxes are rebuilt so the old bell housings result in a lot more oil leakage.
 
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