Just came across this website that's a great flathead reference... http://www.vanpeltsales.com/FH_web/flathead_partsdrawings_links.htm
Van Pelt is referred to several times in S.A. Design step by step rebuild of Flatheads, they say that you can "rent" or buy tooling for cam bearings and valve train. Well in 2022 you can only "buy" the tooling. But the exploded views are great!