Regarding restoring white-metal sleeve mains, has anyone tried this?
The mains in the Coventry Climax engine of my 1926 Clyno car are thick white-metal sleeves pressed into cast-iron end plates - (2 mains). Journals were OK, mains just a bit loose. I pressed the sleeves out and "dumped" them using a specially turned dolly and a calibrated sledge hammer, then hand-scraped them to fit the shaft and added a steel shim to take up the increased end-play.
Worked for me. Probably did wonders for the crystalline structure.