boothy you would be struggling to get much over 200 if you reach that on what you.ve said. your going to need a fmic, some type of ported head/polished head and really swapping to efi so you can fuel it properly. lets face it for a fifth injector your going to pay over 350 them getting it all mapped and if you then want more bhp you'll struggle so for 750 at jamsport you get there gotech stuff all in and mapped plus you can gain valuable advice as to what you might need to improve your bhp in future of them