I know in 1996 the 454 Went Vortec, so multiport EFI.
Before that they were TBI. I had an 89 and while it was reliable and got the job done. My newer 6.0 gasser tows much better than the old TBI 454 I had.
Having said that my BIL has a 1998 5 speed CTD and towing his trailer with my truck feels similar but it has to REV and burn the fuel to keep up with it.
His truck is 215 HP and 440 FT/lbs of torque.
My truck is 300 HP and 345 ft/lbs of torque.
That torque makes all the difference.
I like the diesel better but I couldn't justify the extra cost at initial purchase as I don't drive it daily. Mine is an 02 with 32,500 miles on it.
