Well, the high rpm stutter seems to do with the fuel supply, whether real, or simply having too small of a filter on it. That fix for winter was a given. I did a compression and leakdown before I stored it, and the numbers weren't that great. 155's +/- 3% across. Leakdown numbers were anywhere from high normal to 38%, so I tore it down. Seems there's a scratch in a wall from a ring, and the piston/wall clearance seems way loose, but I haven't measured it yet. Gonna do larger IM, cams, TB, etc. and just decided to freshen up the whole thing.
If work picks up a little, I may look for a sleeved block, but I'm not sure.