You can just put it o up-side-down if it's not to bad. I did that with my 1955 235 ring gear, not sure how many teeth, no problems after a few years. I kind of think that the gear has chamfered teeth on one side and not on the back, it id not seem to matter when I turned mine over, works great.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-