With no other information than what you have posted, I dont believe you have any reason to increase plug gap. You may get away with 0.040-0.045 for a while, but you will greatly be increasing your chances of a missfire. Iridium plugs or good double platinums reduce the erosion rate of the electrodes and minimize this. Good grounds, brass contact cap and rotor, and low impedence suppression wires all increase the reliability of the spark at increased gaps. Also.the addition of a coil and/or ignition with more power (not just voltage, but current too), will help when jumping that gap and maybe allow you to jump an even wider one. In short- fuel type, plugs, available electrical power, spark plug type and duty cycle, compression ratio, and rpm all are big factors in plug gap choice. the ssay pattern of the injectors, within limits, has little effect on this.