I take it your engine code is X10XE.
To establish the correct timing position,the following condition need to met,
the camshaft locking plate in slot on both camshafts to top of cyl head.
crankshaft locking pin on bolt plug near the oil dip stick tube on side of eng block.(TO OBTAIN tdc on cyl 1) remove false bolt to push in pin to lock on crank web.
timing disc inlet sprocket.
Once you satisfy above the timing position in set.