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Can I do something in the $2000-$3000 (incl labor costs) range?
Including Labor...You should be able to do a Cam only with all the goodies needed(Springs, Pushrods, Retainers, Seals, and Seats) and a LS6 Intake Man.
You're at the point where to gain additional power you'll either need to go into the motor and do a cam (at a minimum) or jump into the deep end and go FI.
My preferance would be FI - either Turbos or Blower.
With a $2-3K budget I would do a cam and LS6 intake manifold.
Cam now with all the upgraded springs, ect. as posted above with plans to do heads next is what i'd do. You'd only need bare castings basically then, since you'd already have all the springs, retainers, ect. to go on them
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.