Good to know about the TBI 454....Ill have to look into it, I know there pretty easy to find. My brother has an 89 and he's not thrilled with the power that it puts out...Ill have too look up numbers but my dads 2001 6.0 out pulls my brothers 7.4. I thought about going the 6.0 route but the smog requirements here suck! Currently I dont require any smog equip on my truck except air, and thermostatic air cleaner, not cats etc. So I may stick with a 454 from the same year range, and then do an aftermarket injection after its refereed!