To rebuild or not to rebuild, that is the question
One of the persuasive issues to me in my decision to go with the full rebuild, was the knowledge that anytime something goes wrong with the powerplant, you end up pulling the engine and tearing it down. That is a significant expense. To do three or four major repairs, you now have duplicated this expensive effort (i.e. the removal and tear down). Thus, in the long run, it will likely cost far more doing it in a piecemeal fashion.
Further, notwithstanding the prior mechanics assurances that the engine was solid, since it was not original to the 79,000 mile chassis, I had no idea what lurked within. The only way to confirm the condition was to do the tear down. In my case, it needed a new everything. Right down to the main bearings. New valves, injectors, etc. The crank, rods, and cams were servicable, but they too had their turn at the machine shop. Also, given the magnesium case, we elected to shuffle pin. The obvious slippery slope is that as you progress with the project, the more you have expended on the project, the less significant that cost of the next little tweak seems (until you add it all up.) But, alas, I did have the objective of longevity and reliability, and avoidance of repeat teardowns. Absent a missed shift, it should hold together.
Hopefully, in your case, you will have better news, and you may not have to expend as much on the pricey bits. Good luck with your venture.