This is the best info I've gotten from Hollander exchanges from the junkyards:
The short block is the same, however 99-up heads are different. So, you could use the '00 short block and your heads, intake, etc.
I would think it would be easier to see if the manifold from the 96, and all the other accesories, would bolt up first though. No need to rip off the heads if you don't have to.