I did it, All the front acc bolt right up. I actually even put my 5.3 heads on the ls2. There is diffrent head bolt lenghts, but thats no big deal,just buy head bolts for an ls2, its just beacuse of the aluminum block. The Knock sensors must be extended and put on the sides of the block instead of in the valley cover like it is on a 5.3 Also the ls2 reads the cam position sensor from the front so you must re-wire your cam sensor and extend it to the front of the block to plug into the ls2's cam sensor up there. The tricky part is that you must switch some wires, I cant remember what ones right now, but i know you cannot just wire it up, something must be switched.
Everything else worked fine for me, the 5.3 intake, headers and all the accessories bolted up. I do not know if the 5.3 intake will bolt up to the ls2 heads though, like i said I put my 5.3 heads on.