The DGV/DGAV 32/36 is a ace carb, depending on how much power you want, it's a mechanically progressive carb, ie secondary(36) starts to open after about 2/3 open on primary(32), a lot were replaced with 38DGAS, or if you could get one a 40DFI, both mechanical carbs, the 40DFI was synchronous(non progressive), ie both throats open at the same time/amount, these were fitted on the 3L capri v6 etc, the 40DFI was a upgrade perfomance wise.
The main diffeence is the age of the carbs plus the engine configuration they fit, the ida and idf for example are used from fiat 124 to lambo urraco to porsche and even Escort RS2000, which could be had with a 44 IDF 40/41, the lancia stratos for example used a 40 IDF 28-29,28(2)-29(1) x 3!!
Age is the big thing, the dellorto DHLA is a better carb than the dcoe, they look similar owing to being designed by the same man, now retired and living in Hingham, Norfolk.
Why do you want carbs, efi is just so much better in every way, you can get the same noise as carbs with tb's as well so best of both worlds.
If you seriously want to know the intricate differences Haynes book number 393 covers these in extreme detail for rebuilding each.
tabetha