You'd have an easier time swapping the entire head package, and you'd get more benefit from that anyhow. The reason the HO manifold runners are higher than the Renix is due to modification of the intake ports in the head proper - the angle from the intake plane to the intake valve was reduced to increase airflow into the head proper. Apart from that, there isn't much reason to put the later intake on the early block and head.
I'd seriously consider the head package swap, especially if you can find a donor 99-01 head package (head, intake, exhaust.) Most of the stuff willl bolt right over, excecpt for the mods to accept the Renix tbody, or mods to the HO tbody to accept Renix electronics. The OEMR Renix tbody would probably be easier to retain without mods, and should be less work.
5-90