Just changing the rockers (and springs) to 1.85's will yield a .60 inch lift. I am looking at this myself. The 02-04 LS6 cam would actually love this but I am thinking about staggering them. My buddy and I are bench racing this idea and think it may be better than 1.85's across the board.
As for your question of is it worth changing these things, you need to decide what your ultimate goals are and how much you want to spend to get there. Then you'll know if it is worth it or not.
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