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Peter makes a good point about the ring and pinion. A '69 912 likely has a 6:29 in it, which is weak and frequently comes out with pitted teeth. Before you tear down the whole gearbox pull the sidecover and inspect the ring and pinion. If it needs replacement bolt the cover back on and send to a professional.
Most shops will not charge less to rebuild a gearbox delivered to them in pieces. In fact many will charge more because they have to spend more time sorting and organizing the components.
If the ring and pinion is good, proceed with your DIY plans.
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