Ditto, unless you're rebuilding a LOT of engines pretty much full time.
Plus I'm certainly not bragging, but I and all the diesel mechanics I ever worked with took enough care and precision on rebuilds that I can't remember one failure anyone had over the 100's of engines overhauled over the years. They just got stuffed back in the truck or tractor, fired up and gone. A couple of us got sent to an IH engine factory school years ago and they had a 3208 Cat engine in a really slick engine stand with a stack exiting the exhaust through the shop roof, but there again, they were doing research and development.