I don't think it's so much an issue of a Z31 swap working, I don't think they are anything special. Plus, I think they are 4lug.
The front hub swap on an S14 is as simple as it can get. Get S14 5-lug hubs, and put them on. The rear is not as simple because you need to remove most of the links on the upright, or remove the upright altogether to get access to the 4 bolts on the back. That and you need a monster socket (36mm iirc) to get the axle out.
The S13 front conversion can be done with aftermarket units that equip it with bearings that work on the S13 spindles. In all honest, it's going to be cheaper, and easier in the long run to use aftermarket hubs. PDM racing sells them.
-Alex S.
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"What about the twinkie?"
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