Need advice on rocker arms!

[willem445]

Hi all, latest project was replacing valve covers and oil pan to hopefully stop the leaks. In the process of cleaning up head for the new valve cover, I noticed 2 chunks of metal sitting in the head. Pulled them out and narrowed it down to one of the rocker arms breaking. I pulled the oil pan first and did not find any chunks or even metal shavings in oil.

Couple pictures:







I'm not very knowledgable yet when it comes to repairing engine internals. From what I've read, it's good to just replace all the rocker arms and pushrods while the covers are off.

Any recommendations for rocker arms? Just go with stock or upgrade? I found these on Summit.
What about pushrods?
Any advice for replacing the arms and pushrods? This will be my first time.