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I rebuilt my K26 myself. When I first bought my 79 I dropped the engine for a general cleanup and some leak repair. I rebuilt the K26 at the time with a genuine triple K rebuild kit that I got from Vertex. I don't know if the genuine kits are even available anymore. I had the rotating assembly balanced and the balancing shop scribed the impeller and shaft and it was reassembled with no problems and has operated fine since but that's only 12 k miles. I've done the same with Holsets since then for a Cummins diesel project and they have been fine. I don't think VSR balancing machines even existed prior to 1984 so any rebuild prior to that was done on a low speed machine? But the K26/27's and Holsets turn relatively low RPM's (150k max, usually lower) compared to the more modern and smaller turbo's that spin upwards of 200K and require VSR balancing to really last. This doesn't help the OP's stack up problem. I'll take a closer look at that later and see if I can help.
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