Strangely, I can recall seeing only 2, MAYBE 4 boss '9s back in the day. Generally they weren't anything to write home about, Hell even the P/S guys couldn't make 'em work back then, but I do recall one fairly nice one at N.Y. Nat'l back then. I don't know what he did to it, but he made a couple of good high 12/low 13 passes in it then on his 3rd or 4th attempt the clutch let go in grand style---parts everywhere! My guess is it was gone through but the idiot didn't use a quality clutch in the re-build & that's why it let go like it did.........