hey mate
mine only had 128k's on it before it shit a piston. ended up setting me back around 600 for new pistons, rings, mains, big ends, bearings, only thing i didn't change was the waterpump. Was working fine, DONT TOUCH IT
Anyway, whole rebuild only took the full weekend although with the low k's i only had to re seat the valves and gave it a light hone.
best of luck