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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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