I'm running a classic FAST system on mine. Not a drop in and go by any means, esp. if you want to see the better mpg. You need to be willing to invest the time and energy to understand what all the tables are doing on the high end systems to tune it razor sharp.
I would agree that a WBO2 with gauge/logging such as the LM-2 is a great start. I run one on my race car which is carb'ed.