Hello, I have a 52 plate 350Z import. I have recently found out the engine has had it. The problem started with oil soiling the spark plugs mainly 1 and 3 on the left side, misfiring and a rattle when starting up. I understand from the garage the piston rings have gone and also the bearings on the rods. Is it worth getting it re built or am I better off buying a new or second hand engine? Also does anyone have any contacts or know who is best to contact? This is beyond my knowledge lol I'm checking the oil every few days to be on the safe side just don't know which way to go. Really appreciate any advice thanks in advance.