I've viewed those drawings in the LMC catalogs as useful for picking out the part you are seeking, but not necessarily accurate for the actual installation. Trying to confirm that a part listed a vendors catalog can be very frustrating and time consuming, however. The drawings are useful for that and a real time saver sometimes.
I have the '29-'54 Master Parts Catalog on a cd I bought ($10 off ebay) and it is also at the Manuals Online website which is a really great service. You 'bolters are also a huge help!
