I would think a 13.5 @ 110 would have somewhere around a 2.4 60 ft. I've run 13.0's @ 110 with a 2.1 60 ft. Every car acts a little differently though.
You've got a 12.50 on a slick for sure.
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1988 Mustang GT
11.8 @ 123 (7/14/01)
1992 BadAzz Wrangler
1993 Explorer
See my car at:
www.mustangworks.com/cgi-bin/moi-display.cgi?179