You gotta see this ......

Man if you can't do the work yourself you should take it to a shop that can.

Changing the rockers out won't do a thing if the valves kissed the pistons to create that damage, you'll just break something else. Maybe that's not what happened, but it has to be checked at least. Same with the pushrod length, needs to be checked and the damaged pushrods replaced. What about the lifters? The lifters on those arms need to be checked too.

And if you don't know what cam is in there, you don't know if the spring pressure caused that issue either. Could be something else, could be the wrong springs, etc.

If you just throw parts at it, you could end up throwing a lot of expensive parts away.