Is the play in the B.B. shell or at the crank/taper interface?
The square taper is different Shimano vs Campy in the 80’s and may result in some improper seating of the crank. In some cases the crank will bottom out on the taper but I can’t perform the mental gymnastics right now to remember the specific mix/match situation where that will occur. My take home from that though is I use Campy spindles with Campy cranks.
Regarding the spindle length, late 80’s and early 90’s C Record, Chorus, Athena doubles use 111 mm spindles. Need a pic to give better advice on that.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '95 Gios Compact Pro, '95 Carrera Zeus, ‘81 Masi Gran Criterium, ‘81 Merckx Pro, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, Rivendell Rambouillet, Heron Randonneur, ‘92 Ciöcc Columbus EL