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Just for clarity, although I have not re-read the AD for quite some time, it requires the replacement of a non-VAR crank any time the case is split. This might suggest you can still run on condition Part 91 provided you don't ever split the case. The bottom ends of these engines are pretty good.
If memory serves me correctly, the issue with the non-VAR crank is interstitials or very small voids or irregularities that can form in the traditional casting process. These very small voids become the start points for stress risers and thus crank failures.
There used to be a credit towards a replacement crank if you have that issue, however the last time I looked at the overall economics, the additional price of a factory reman gave you a pretty good warranty and added value to your aircraft. You also got the most up to date engine so that is the route I took.
Mind you that was before the current price of 100LL and softening of aircraft prices.
Regards - Dave
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