help with my shee

[nicebanshee]

so i w my local riding spot my bike was running fine then all of the sudden i realised i was overheating so i starded to head back tomy truck my bike started smoking really bad out of my left pipe i ran it untill it shut off (i only rode for about 20 min) i added water then when i tried restarting it i noticed coolant leaking out of the head bolts i took it home took the head out and noticed the gasket is bad but my cylinders look fine the only thing is that with the head off if i kick it water is coming out from the bottom of both pistons is this normal with the head off or am i in for a rebuild? also how do i know what piston i need i noticed some pistons are for long rod and is wiseco the best way to go?