I always double check the flywheel with a dial indicator. Those drivers were so hard on parts especially clutches, it didn't do much good to make everything perfect on fleet vehicles. I put a clutch in a Chevy aerial boom truck C-50, "new everything" and it came back a week later with no lining on the clutch disc. We heard the driver was swinging the boom around back and then popping wheelies with it. We took away his boom truck and gave him a ladder. Only on the really-really heavy trucks did we machine the flywheel and install a "new clutch", not a rebuild. They were pain in the butt to do, remove the PTO to get the trans out, we wanted to make sure we did everything we could to make those jobs perfect. I worked as a phone company mechanic when we had about 400 vehicles, all with clutches. If the flywheel checked out and wasn't burnt up too bad, we scuffed them up a little to get rid of the polished surface and installed a used rebuilt clutch from a rebuilder we trusted. We stocked spare flywheels already turned in case we needed to replace one. We always replaced the pilot bearing and T/O bearing. Three finger and diagram clutches, whatever it ordinally came with is what went back in. Usually, we had the clutche jobs back in their stalls in four-hours. The advantage of having hoists to work on them. I installed them by the hundreds over the years; they went through clutches fast. I keep waiting for my asbestos lung cancer to pop up. That was in the 1980s when we had a clutch rebuild company we trusted. Every once in a while, we'd find a clutch that was boxed wrong. Never give the parts supplier your old clutch until you know the new one works. If it was my personal vehicle, I'd keep the old clutch forever as a future sample to compare the height of the machine surface and the fingers. Make sure the fingers are sticking up exactly the same height when the clutch is tightened down. We had real trans input shafts to use for lining up the discs. Make sure the clutch disc fits on the trans splines, sucks to find out they don't after you've spent an hour trying to figure out why the trans won't slide in. That happened every once in awhile.