So I did a little snooping around on Ebay and I found the bow you bought. I'm thinking you might have made a little bit of a mistake. Yes it's a decent price but I don't think you should have bought the bow without knowing the draw length. THe model Allegiance you bought is an 05'. The 05' model Allegiance's, you can't adjust the draw length without adjusting the cams. Being that it is an 05', I'm not sure just how hard it will be to locate the correct cams you need in order to adjust the draw length. Just an FYI
BTW, you got a "decent" deal. It's a 2005 model bow. They go pretty cheap now days.