My experience was that the Lean Burn systems were SO troublesome & short-lived, that dealers would "retrofit" vehicles with the lean burn problems to undo the whole system. I had a '78 Dodge Super Coupe that was all factory with the lean burn system, even replaced the computer unit with an NOS one from Rick Eherenberg, & the car still ran like total crap - felt like it was firing on 5 cylinders all the time. I disconnected the computer & installed a single point distributor & it was like adding 100 HP to the engine.

You can have the lean burn.