you may have to ask a chrysler dealership or factory service shop to find out for sure if your motor has "free running valves" meaning there is room for the valves to open even with the piston(s) at top dead center. you also should try to remember what engine speed you were at when the belt snapped. snapping is usually safer then "jumping" as far as your engine goes. if it did snap and the engine was at a low( under 3000 rpm) speed you may not have to worry. when th belt snaps the cam will tend to stop in a position where it isn't under pressure. opening valves applies pressure to the lobes on your camshaft(s). the reason why jumping is worse is the cam is still locked into position with the crankshaft... and rarely is the position very colse to correct. you can bend your valves trying to start your engine after the timing belt has jumped. that is why they are scheduled for replacement betweeen 60-90k miles or 3-5 years, whichever comes first.
hope you got lucky.
