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I was actually thinking backwards! Oops. The HO head will bolt on to the renix block. HO heads have raised intake ports so you'll have to use a 91+ intake manifold. Dunno about the rest.
Clifford, Borla or Banks (forget which one) and Pace Setter make headers for the 87-90 4.0. The Clifford doesn't come with a down pipe. Pace Setters are lower end stuuf and some quality issues I hear. I didn't have any problems with mine. The Clifford has the bung or boss for the EGR. The hole needs drilled out though.
You can swap on a latter head. The 91-95 cams are basically the same as the cams used in the Renix. There are some who bore out the Renix Throttle Body. Artsounds use to do this and Armour XJ does. Artsounds was about $100 bored to 59.5mm.
If you swap on a new head, you will need to adapt a newer TB or have an adapter plate for the Renix TB. http://www.rockmodified.com/2003/april/TB/tb_perf.htm
Tom