thas is a clean install. The injectors are most likely modular so you should be able to find some smaller ones. The size of the injector determines the minimum duty cycle of the controller. Smaller injectors dont need a very short duty cycle, which the big ones need to get a proper idle on a smaller displacement motor unless the fitech cuts an injector(s) for an idle. Youll want to size the injectors to your maximum HP and not much more. Like having a dominator on a 273, it just wont idle properly and wont be that tuneable in its A/F ratios.
