The guys above have covered it well, also if ya rocker cover is off, on the 4L there is a mark on the cam wheel that lines up with the dizzy side of the head.
Lines up horizontal with the top of the head , to the right as you look at it from front of engine bay. Just make sure you check the pressure on No.1 cylinder as stated above. And mark the dizzy position in liquid paper before ya move anything once at TDC.
Oh, and head gasket can leak water to oil....oil to water, compression to water, or just blow it out the side and lose compression, depends where it blows.
Also , when you put the new intake gasket on it torques from the centre-out, go in a square and work ya way out, will help torque it nice and flat.
While ya got it off, check all ya vacuum lines on the intake manifold too for leaks.
Hope that helps.
Jack.