I have a fuel injected 408 using the Ford's EEC IV mass air computer system and I am using the A518 transmission in my Cuda.
Be prepared to spend some loot and time to achieve your goals. Building a 408 is a project. Fuel injecting it is also a project with it's own hurdles. And, adapting an A518 is definitely not as easy as replacing your existing transmission.
I am not trying to discourage your goals, but I want to make sure that you realize these upgrades require a lot of patience, money, time and fabrication to get right. It is not a bolt on process. That being said, it will be absolutely awesome when it is complete. I’d get the 408 and the A518 in the truck first before attempting to fuel inject the engine.
http://www.youtube.com/watch?v=u1bjlLnHg9khttp://www.youtube.com/watch?v=0B9x9YOfeYchttp://www.youtube.com/watch?v=A7kTRU1EcQs
