Gts identification

[Fabio]

A good few years ago my dad purchased a 'gts engine from someone, however the small amount of info that I could find hasn't been very helpful. Did the gts have a cross drilled crankshaft, as well as 3 compression rings and bigger inlet valves(35.6mm)? None of the above mentioned details are present in the engine we have expect for the blocks identification tag that says 12H-GTS. Also can anyone identify this camshaft? Camshaft is spline driven.