If'n I just had to do a complete motor for my Sport, I would try and recreate the build of the Telaio Rosso V7 Sport that were built in the race shop with the internals all polished and balanced, "blueprinted"even.
I had thought that might be on my 100,000 mile to-do list, but looks like I'll just be changing some fluids, replacing a few seals, and thinking about SpeedHut.