Its not so much the cam you should question, but the other components that also can contribute to inaccuracies that are involved in this process. If you don't at least check it, you won't know where it is. And if it doesn't perform as expected, you'll always wonder "what if".
I haven't yet done the degree wheel on my build - I guess I will eventually. Used wheels show up on ebay all the time.
The cam-doctor card tells the story of the timing events clearly enough. My dial gauge tells the story of actual lift (which is always shy from the theoretical rocker-ratio) . . .
