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 - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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