Denny, I have used the back side of my old 645 Sioux for resurfacing lifters. It is a 50 to 60 year old machine, but it works. I set the angle between 1° and 2°. If you figure the radius of the lifter surface, the 1° to 2° angle will give you a crown, but I don't think it will be enough to measure the way you are trying to measure but it will cause the lifter to spin. If you Google something like "solid lifter resurfacing", you will find quite a few people companies that resurface them. Why not call them and discuss it with them.
I mess with Y-Blocks and GMC. They both require a crown on the lifter.
