Beautiful bike and the color is a great Celeste version.
Brifters didn’t come out with 105 until 1992-1993 so I am guessing that was a later up grade?
Agree with Clang, that’s a lot of seatpost height for that frame. Tough to make it work up front though you could get a riser stem to make you a bit more balanced in the saddle.
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1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 1982 AD SLE, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super