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901s had a few variations. Many parts are interchangeable across the models, but not all. The early ones were aluminum and had a different differential than the later ones. The magnesium case started around 1968 (?). The 70-71 version (technically a 911 instead of 901) had a different clutch release mechanism, so the case and clutch fork are different. The 914 trans (there are actually two versions) is similar to the 911 mag case trans with the earlier style clutch, but has different shift forks and a different nose cone. Generally a lot cheaper to buy a complete trans, even if core, than to accumulate parts and build one.
Swapping to a 915 is a bigger deal, and 915s have gotten expensive.
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