OP, you do have a very nice bike there. I have owned my Bottecchia since 1989, when I bought it new. The only upgrade I have done to it was to change the original Campy groupset to Campy Athena 11 speed.

Don't worry about using 7, 8 or 9 speed. The rear spacing in your bike is probably 130 mm, which allows for all of those speeds.

Good luck to you and happy riding your "new" Bottecchia.