ok all you mechanics out there...my gimbal ring is cracked on a 1976 255 hp mercruiser. I have already found and bought a used one. How much can I expect to pay to have it done? I ask this because one mechanic told me it was a 4 hr job, another told me it was an 8 hour job, and yet another told me it was a 10 hour job.I have read about the procedure to try to do it myself...but I know better thanks