I thought about useing the 24 valve quite a few years back, untill I learned of all the stuff I'd have to do, esp. in CA to meet emmissions.
Whole wiring harness and ECU and stuff like drilling/ welding 4 O2 sensor mounts for the 24valve setup.
If I was gonna go to all that trouble I'd get the 3.5 or 3.8 SOHC.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.