F.A.S.T EZI Good/Bad? anyone?

FAST EZ is quite expensive, and that only gets you throttle-body injection (TBI), which was archaic in production cars 15 years ago. Much better than a carb, but you can do even better with multi-port injection (MPFI), at least for mileage and lower emissions. None of the after-market is cheap enough for the benefits, in my opinion. Much cheaper if you roll-your-own from production parts or buy 2nd hand, often new from guys who planned to, but didn't follow thru.