Mine worked quite well before the computer went haywire. Most of the problems are with the ECU not the mechanical part of the system. Mine was custom made individual 8 stack injection. (still have it if anyone wants to buy it cheap) The main problem is computer that controls it. Most people are not fluent enough on the computer to do it. Here is a great link to all the different controllers out there.
http://fordfuelinjection.com/?p=65