Cheapbowlingballs.com always has a lot of closeouts and seconds. I used to buy from them a lot. Many times, there was nothing spec wise wrong with a lot of them. The ones with good specs were slightly undersized and required a towel underneath the ball in the jig so that the clamps could lock it in place.
Long pins get very interesting especially when you have to drill with the core inverted. One ball that I never really liked that everyone seemed to love was the original Silver Streak. Without surface it was always very over under for me. I bought a Silver streak Blem with an 11" pin from Cheapbowlingballs.com and had to use the "anti-pin" for lack of a better term. I drilled it with the newly marked pin 5" under and it was an awesome reaction. I got that one to continue about 3 stronger than any of the layouts on the regular Streaks I tried. There goes manipulating core numbers for ya.
Good luck TJ.