im working on making my 81 hardtail with about a 10" stretch, back into a softtail. my main question is at what angle is the shock too steep or too flat, and how far from the axle is safe to mount the swingarm? Ive seen bikes with alloy swingarms, with the shock allthe way to he front of the rear tire, and been told by an oldschool builder not to go more than about 4 inches from the axle plates....... Any input would be helpful. heres a ink to it on xs650chopper.com http://www.xs650chopper.com/2011/06/wwii-rat-bike/