It's hard to say whats period-correct, Jim, because you and I might be the only people who've tried to put sport-tour gearing on a Masi! Personally I'd point you toward a Nuovo Record front mech with a Campy Rally or Huret Duopar in the rear. Both are very durable. The Rally doesn't shift as well as the Duo by a large margin. Or if you want to stay Euro and go more modern, the Campy Racing T is wide range, slant parallelogram, not too dear, 8-speed vintage, and shifts in the same class as a slant para modern rear mechs.

Other odd vintage options: dual pivot Simplex, long-cage Huret Allvit, long cage Huret Jubilee, Campy Gran Turismo, and remember the Rally had three versions. If you look these all up, few shift as well as modern. The Duo and the old SunTours are standouts.

If you could live with a 26 in the rear and a 10 or 12 tooth spread in front, I'd say put a Campy Nuovo Record on front and rear.