Several things to watch for: the cam for a injected engine usually has an overlap dimension that should be maintained. Depending upon your ECM, it may be a bit different than a carbureted car. For instance, my 350 injected chevy (MSD throttle body and MEFI2 controller likes 112 deg overlap. Call your ECM tuner and discuss before buying a cam. Since you say you are using the stock ECM, I will predict you will NOT run better than the carb setup with a stock ECM program. There are people who can modify the program (late model computers do NOT have a "chip" for better performance) Compare the price to hack the stock EEC Ford unit vs using a FAST brand or other controller. Dont fall for the "self learning" controllers, they are for mild street use..... The fuel pressure needs to be in the range for the system.....a mechanical pump will not cut it.