[Masteryota]

Um, well first you need to find the culprit that caused it to jump, otherwise, all repairs may be done in vain.

If the engine is an 'interference' engine, you need to take the head off and examine the valves and piston closely. Any impact on the valves means they need to be replaced. Chuck the valves in a drill motor and spin, any deflection, and they are toast. Depending on the nature of the damage to the top of the piston, it may also need replaced. Check everything connected to the valves, springs, retainers, guides, seats and rockers for damage. After that, you will for sure need a new chain, possible guides and cam sprocket, and get a new tensioner as well.

FYI, this still applies even if it is not an interference engine. I have seen plenty of non-interference engines touch valves to piston when a belt jumps at high RPM.