I am currently in the middle of doing this. I asked this very question many times and got many different answers but the answer is yes, it will fit. You will have to reroute some hoses I was told but it does fit. Now the real question is what else are you going to do to your engine? If you are not going to port your heads and/or put a new/different cam in it my understanding is the Gen II manifold will not yield you any gains. The TB's on the Gen II are larger, 65mm, and the injectors are pushing a higher lb. This is one of the things that allowed the Gen II motor to be rated at 450hp vs 400hp in most Gen I's except for the 96 RT. If you do a search for almost the very same wording as your post I am sure my old post will pop up and you can see all the related info therein.
Craig,