340 Cam Change - Lunati vs. Comp.

OK..back to the subject of this post..there has been alot of talk over the last few days about cams and intakes. I need to know about the heads. As I mentioned before, I'm going to be using stock 340 X heads. I was prepared to change the springs as needed for the cam I choose, however I appears I may need to do more.

My question now is, what cam can I safely run with completely stock heads? What is maximum lift and duration? It sounds like my two choices will need more than new springs. They will need more machining etc...

As of right now, I want to go with the Lunati 60403, but will i need new rockers and/or pushrods?