when you're ready i may have a set of big brakes parts availabe to buy in the new year.
i ended up with two sets, one for my 33 and the other for my sud, but i've decided to stick with inboard upgrades on the sud so i may sell the parts i had put together for them, but it will depend largely on what size wheels you're going to run as to whether you could use them.
they are brembo four pots and 305mm vented discs from the fiat coupe 20v turbo, or brembo four pots from the alfa 166/gta and same discs again from the fiat.
both sets will need adapter brackets for the calipers but the discs just drop on and are chosen because they still retain the 4 x 98pcd stud pattern,
i'm led to believe these work very well right form the start, but have heard that a 75 master cylinder is slightly larger inner bore than the 33, so pushes the much bigger calipers a tad harder too, and is a worth while modification also.