Hi agvonline
There is a plug in the top of the gearbox bell housing with a pointer for TDC, the cam sprocket has a mark on the inside, lines up with the front flat gasket face of the cam cover. Best way to set the distributer up is to remove the cap and line up the mark on the rotor arm with the notch in the dist body (look for a single notch on the face of the dist where the cap clips on).
Steve.