I would sacrifice the gear backlash spec in favor of matching the existing wear pattern. Some extra backlash won't hurt like it would in a highway vehicle where you have a lot of accelerate-coast-de-celerate cycles that can rapidly load and unload both sides of the gear teeth.
If I had NOS parts I would definately follow the book and set things up accordingly. With these 80 year old parts the original tooth profile had changed due to wear. I can see in the photo where the old pattern is. The gears will be a lot happier (and quieter) going back to their old set way.
I'm with Jim on moving the pinion in to at least better center the pattern that you have.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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