I know a lot of people use used cams. What is they best thing to do if you do use a used roller cam espically with lifters? What could or would happen if you use stock lifters or the lifters that were run on the used roller cam? Do they need to be matched up were they were ran? I know with non-roller cams you need to match the lifters with the lobes they ran on but is it a huge deal with rollers as they don't have the same wear patterns as non-roller cams? Any input would be great....thanks.