Check out the megasquirt forums, guys have done all kinds of stuff. Like said, it's the cheapest efi system out there but a steep learning curve and you have to do everything yourself.

Right now the price for the FAST EZ-EFI system for port injection is very competitive, so much so that for the few hundred bucks more it costs over a megasquirt, it's probably worth it for most guys just for the ease of intallation/tuning, even though it doesn't do spark.