I have all the vintage manuals and most of the later ones, except for the 201s, and can confirm their worth. They are not as complete as I would like, but by cross-referencing between the various manuals, like the 108 and 107 manuals when seeking data on the V8 models, you can gain a surprisingly complete picture of virtually all systems. I have found it most handy to use the manuals with the index system created by Steve Nervig. I recently tried to access his website and found it unavailable...maybe someone else has a new web address for this index.