Its not just a direct swap though...
You have to use basically everything from the head up from the donor vehicle. This will also net you alot of horsepower.
Some have "tried" to use the RENIX manifolds on the newer head, but from what i have read its WAY WAY easier to just use the ones from the HO. Plus then you will have the benefit of having the HO throttle body, and i believe the exhaust manifold is a better design also. This will also mean you will need the downpipe (or S pipe) from the donor vehicle as well.
Ive been wanting to do this for awhile, but i decided to wait untill i built a stroker to do it.
Um .. the only thing that i remember isnt really a direct swap is the TPS... you will need to get an adapter for it (since you will be using all the sensors from the RENIX.
If you need more detail then that just post back, and ill try to give you a play by play.... search is your friend.
Hope that helps.