Joined: Jan 2008
Posts: 23,639
Likes: 1,106
From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
Go to the Sheldon Brown site and you can calculate what 3 teeth will mean to you.
Myself, I would either look for a compact crankset, or a LD rear derailleur and a larger rear cog.