$.02 From the repair stand 30 years ago today...
Carlsbad Masi's were by production 120mm unless by special order, they had lots of 120mm hubs to use. At least to 1977. Italian bike's ? My 1973 is 120mm fwiw, 1979 is 126..
Starting in 1974 local racers started to want 6 blocks, very few frames or bikes came with 125mm . As John Howard stated in an Competitive Cycling interview in 1973, if I recall correctly, 52th chainrings and 14t cogs just don't cut it....
Regarding Matteo's, if you are going to ride it, then how about a Non stock ultra 6, & save the Everest 5 for show. You get six w/o a long term commitment.
And yes, we spread a few... in the day, always clamp the seat stay bridge.
Today in Torrance