[Batman]

I'm not really sure, I would assume they would with some finagling since the 3rd gen has a bigger engine bay then the 4th, especially if you are dumping the emissions stuff. A Y-pipe may be a problem might have to have something made. Worst case you could always get regular style headers with a bigger opening then the D-port on the heads. I've also heard the ZZ4 with an LT4 hotcam or any bigger cam becomes a nasty motor in a hurry. (I've seen a car with a ZZ4/hotcam setup put 389 to the wheels with an TH-350). I think GM is a little conservative with their HP ratings on the crate engines.