Plus Cadillac came with the worthless 2-4-6-8 system and it did not work very well.Most people unplugged this system and it ran a lot whole better.The 4.1s were known for headgaskets going out.Some 4 door RWD Cadillacs had the 350 and I have seen one with one with the TBI setup.1991 LTIs were the early version LTIs and are horrible to work on.I replaced injectors on one in a Corvette and is a real pain in the butt job to do.