We've just finished the ground up restoration of this 1972 750GT, it came to us in quite a state with lots of difficult to find bits missing, the good news for us was that the original factory engine seal was present and although there was wear to some of the engine internals it meant no one had been inside it messing or bodging since new, which made the engine rebuild nice and easy.
We've upgraded a few bits from the original spec for ease of use like the twin Lockheed disc setup, electronic ignition, 32mm DellOrtos as the later GT's and some modern shocks.
It rides as well as it looks too.