The first number, 13, means 13" diameter. The second number, 14, means the prop will travel forward through the water 14" in a single rotation.
direct or V, 1:1 or reduction?
Since you think the 13x14 is a dog then I would guess that it's a direct drive 1:1. Most 1:1 direct drives use a 13x13 as their baseline prop, heavily weighted boats often step down to a 12" pitch. Keep in mind that your boat will definately use more gas when cruising with a lower pitched prop, probably about the same when boarding.
Check with Karl at www.boarditup.com
, he is the prop man here.