I may be getting an 89 crew cab dually w/ 454 tbi . its a trade from my dad for my crew dually. only prob is the 454 probably needs a rebuild. brother ran it hot on the highway for about 10 min. then it got hot again when we tried to do emergency repairs to limp it home since the belt broke in the first place. dad says it smokes (I still have not started it yet) and I am thinking @ 198k maybe it is time for a complete rebuild. I was wondering how much power will the stock tbi setup work for? also would it work w/o all the sensors like o2 etc? I was thinking about "rodding" this truck when i rebuild it and port heads w/ big valves, add headers and free flowing exhaust and probably cam. depending on how much power i want when i get to it.