a few things... buy a 6.0, its a much much better motor, and if you arent wanting to do a head swap, buy an LQ9, they are more expensive but they are high compression. as for camshafts, if you are going through the trouble of swaping a cam, it should be for a huge cam.
buy an LQ9, put the carbed intake on it and leave the rest alone.
also, dont waste time on "blockhugger" headers, the 00+ f body and truck manfolds flow just as well.
if you did a cam swap ($400 cam, $40 timing chain, $160 oil pump, $250 springs) rod bolts ($165) carbed intake and headers you could be looking at well over 500 crank hp. there are just so many cheap head, cam options its literaly endless.