Why stand alone? Factory Fuel Injection seems to me the best route, it is tried and true. No aftermarket computer to "tune in" a factory computer also has a better dignostic system than any aftermarket system, and pretty much any shop with a scanner can get in to the codes to see if anything is wrong.
I just swapped out an aftermarket Accel system that someone installed on a Jaguar with a Vette LT1 in it. I put a factory computer on it and as soon as I got it started, the computer told me that the Ignition module was bad. He had been having troubles with the car for a while, and that told me right away what the problem was.