i need to know how to retime the cam on a 85 200x if anyone could help that would be great

 

Take out both plugs on the left crank cover and torn the crank so the "T" is at the mark in the upper (small) plug.
Put the cam with the mark aligned with the small triangle on the valve cover.
Turn your crank to the "f" and set the fire point....
should be good to go from there.