Mopar Stage VI 6 heads questions

Bobzilla said

Are your heads bare? Are you asking if factory cast iron head valves can be used in these heads? Just trying to clarify.

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I know I can use factory size valves in the head. I’m asking at what point valve lift do I need to start modifying parts?

I have a set of 906 heads with stainless steel valves that I will use in the stage 6 heads if I can with the cam lift I want.