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Why not just plan for doing the LS engine swap with 4L80E transmission? I joke.
You mentioned lean at idle, tip your choke blade slightly towards closed. If the idle improves you are a bit lean.
6 turns out is not uncommon with an 85 quad assuming that’s what’s on there. Aftermarket carbs are a crap shoot but you said it was fine before the cam change . These later carbs have fine pitched threads on the mix screws which require more turns.
You can check your cam timing without teardown, google "degree a cam". Really a good idea to do this during assembly to be sure the timing set is correctly indexed between crank & cam.