EZ-EFI only controls fuel, and as was said, any other EFI system can ignore ignition timing if you want. But if the system can control timing I would use it. It's interesting to see the affect that timing has on mid-range torque that most people never knew was there.

next question,i would like using my MSD 7 with one coil,this has a lot of fire power and multiple sparks per cycle, can these systems keep up with it?