Just not worth it. Keep the Renix and get driving it. Easy.
HO myth buster
Renix in 90 made 182 HP. HO in 91 made 190 HP. That's 8 HP difference.
HO only made more HP than Renix at higher RPMs and not a bit more torque. HO had a 58 mm throttle body versus a 52 mm throttle body on a Renix. That’s 20% more air available through the HO throttle body. The HO also had a better design header. See where I'm going with this?
It’s only a 4% horsepower increase…..
The whole 8HP was not mostly from the head, but from the bigger TB and better exhaust manifold.
Put a 60mm TB from www.strokedjeep.com on your present manifold using the Renix head, eliminate the "crush" in your headpipe with proper re-routing, and go for it.
HO stands for Highly Overrated.