A completely stock TBSS will make roughly 320rwhp. You have the advantage of boltons a tune and a cam that is larger than the LS2 of a stock TBSS. You have about 40rwhp more. That isn't out of the question considering circumstances of dyno type, muffler choice, maxed out injectors, clutch fan, 4.56s etc. I would expect different if you had 3.73s, efans, a straight thru muffler bigger injectors, dynojet and a dead on aggressive tune. You would break 400 pretty easy.