Match the the two notches to each other on the bottom end ie crank pully wit the altornators pully wheel, they both have a line on( this must be done with the cam belt off, at the top end there is a punch mark on the gti cam pully, this should line level with the top of the head, no 1 cyinder (nearest the cam pully) make sure the valves are both shut, ie the buket tapets are not been pushed down!
Its a lot easter if you get the manual, I'm just in the middle of doin the head on my gti 1800 and cant get the manifold!
Hope that helps?