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If you do decide to go with a new cam, it is a good idea to at least do Heads too!
A good set of LS6 Heads will flow pretty good for a NA set-up!
You could go with a cam similar to mine 224/228 588" Lift 114 Lobe center - DO NOT go below the 114 Lobe Center, you will have to much "LUMP" to it. Stay w/in the 114 + area as this will also work well for you when you go to Forced Induction!
You can have a smooth idle and plenty of cam, kinda like a sleeper with today's technology!
I hope this helps see my sig below for my progression to where I am at now