Vavle stem height....

On an remanufactured engine w/10k miles the valve lengths are not gonna be identical. The tolerences were sort of loose when the engine was built, the very first time and since then you say the valves have been ground and the seats replaced? If the machine shop is very expensive and very methodical they may be able to rebuild, better than new, but most of the time it doesn't matter, that much. Did you pay for a rebuild or a blueprinting, because there's a big difference in the amount of time invested.