I'm wanting an extra 4 mph out of my beater and am hoping to do it with a pair of -2 shorties. I have a set of 1.5 bravos in rough shape (lowers need skegs) and a recently rebuild pair of 1.36's. I would like to make my use my 1.5 uppers work with the -2's and sell everything else. What's an approx cost of what I'm trying to do (used of course)