1998 Plymouth Breeze Valve timing

I purchased a plymouth breeze with a 2.4Ltwin-cam that will not run. It cranks over easily on the starter. (so easily that it is obvious there is no compression here) The timing cover was removed and I suspect the belt has been removed and replaced with out correct alignment of the cams. The thought of bent valve stems has crossed my mind. So my question is 1. Can the pistons hit valves when incorrectly timed. 2. what is the correct timing procedure for this motor? Thanks CZ