With Bio-Pace it was built between 1988 and 1992. The serial number would lead me to believe 1991. This site
http://www.trfindley.com/flschwinn_1991_2000/ may help you decide on a model. If you are going to single speed it try riding it for a month in one gear and decide if you really like that or not. From looking at the picture I would say the frame is too big for you as you have the saddle way to low for that frame. Good luck with it. Roger