i recently bought a 85elx off a family member for 150 pound. The head gasket had gone on it and they had started stripping engine down. Im now fixing it but they had only used tipex to mark timing and i dont really want to rely on it so if i set pistons at mdc and lock crank then turn over cams and lock them is this how i would time the engine and also how do i set pistons at mdc.