To use stage 2 cams on these engines requires HRC valve train parts (springs, seats, retainers,etc) which are no longer made since last year.
Unless you can find some hiding in a warehouse or someone willing to part with theirs, it will be difficult to go from there unless you have them custom made.
From what I've heard from individuals who have seriously built their engines, the OEM rods are plenty strong, and titanium rods unnecessary.
For titanium valves and required compatible seats, you might try Kibblewhite Engineering in California. They made a set of valves for one of the owner of previously mentioned built engine.