The UN-54 isn't designed for a track bike. It's so the chainline will still be within tolerance (is that the right word?) for a 2 and 3 chainring crankset. If you're using a JIS crankset, Miche makes a 110mm BB (this is a pretty recent phenomenon--it seems everyone is still wrapping their heads around the fact that the newer Miche cranks are JIS and not ISO).

Miche Primato Track Pista Bottom Bracket 110mm English JIS [1913A00200000] - $29.00 Velomine.com : Worldwide Bicycle Shop, fixed gear track bike wheelsets campagnolo super record vintage bike