Invert the head place on blocks of wood to support it, use a straight edge(steel rule) and place it on top, and slide it gently from back to front, and look for any dips.
If unsure, or any amount of miles a skim might be a good idea anyway.
If the car has not been seriously over heated prior to head removal then it should be fine, just use a FELPRO BLUE HG.
tabetha