ls6 with carb
So just bolting on a carb intake with a 750 cfm carb and you are above your HP goal.
As for cam lots of options. You need to decide what you want to do with the car and what supporting mods/gearing you are going to do before you can decide how much cam you want to live with. There is no one answer.
The LS6 cam you have is no slouch.


