I found a gear ratio / rpm calculator on line, and that's about what it said it would do, which is still a little high, but I'll settle for. Im just hoping that going from 456 to 373 isn't too much loss on the low end. I did look into gear vendors and it looks like around a 3k upgrade. Between the motor rebuild, exhaust, and new carb, I'm in the mechanical for alittle over 3k. Dollars are starting to stack up, and I haven't started on the inside yet. It's not in desperate need, but definitely needs updated. Exterior is in surprisingly good shape. Paid $1500 for it in unstable running condition.