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I have stock LS6 243s, Cometic .040, kooks with hi-flow cats 3" to the back, LS6 intake, with a TSP228R 114LSA 405RWHP 373RWTQ.
How much will I gain with a TSP V2 233/239 on 112LSA .598 and .603 lift?
My guess would be about 15- 20 hp and about 20 ft lbs of torque. The 112LSA should increase your torque band and amount. The increased duration should help you on the upper end.
I have approx the same setup you have now and have 410 RWHP/381 RWTQ (Dynojet).
I previously had a G5X3 cam which put out 435/440 RWHP. The G5X3 is a bigger cam than the TSPV2. I went down to a 224/228 .581/.588 on a 114 LSA to have a better street manners. I am really happy with my present setup.