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I would personally run the s13 housing simply because of the bushings. As far as driveshaft length issues, I've run a j30 housing on both my s13 and s14 with the stock drive shaft with no issue. I don't believe the speed sensor hole will leak fluid. Mine was missing and I just rtv'd a piece of metal over it and it never leaked.
You're going to have to pull the internals out anyways. The easiest solution would be to throw it into the 13 housing, so that's my vote. I have run a shimmed j30 vlsd for about 4 years now and it has never given me an issue. When i installed my 4.36 R&P I even swapped the 1.20mm shim I originally put in for a .80mm one to reduce the clatter at low speed and it still locks perfectly all day long. Make sure when you're putting it back together you have the half shafts in so everything is aligned correctly.
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