I knew of a 58 GMC that was a long bed granny 4 speed . 8 hole rear end six hole front wheels. any way the main bearings where so loose the mains poured oil. when it was idling you could look at the front crank pulley and see it moving up & down. Made a heck of a racket. so they pull the pan and take all the main caps off. the crank is worn & the bearings are down to the copper. So what do they do. they take a flat file and file down the edges of both bearing halves until the bearings fit snugly on the crankshaft. Wrap the outside of the bearings with brass shim stock to take up the gap between the reduced in diameter bearing and the main caps & saddles. They put it back together and the starter wont start it. its tight barely rotates. so they pull it to start it. get it running and by some miracle it worked . I know it ran for ten years afterward. They used a 50 x50 mixture of engine oil and STP.
the entire time those old geezer toothless hill folks where doing the job they had a Know it All Teenager Telling them it was a waste of time. They simply laughed at yours truly and stated during the depression they had fixed T models in worse shape and used honey instead of engine oil.