Unless you are starting over with a standalone ECM/or a tuneable stock one on a dyno it's just not worth the time to mess with. You have all sorts of issues to sort out, injector dead time, idle issues with not being to pull enough pulse width out, accelerator pump issues, baro/temp issues with pulling/adding fuel and the list goes on. Also you have to think now you have to have a place, time, and a easy way to tune on the hill so that also adds to the headache then on top of all that throw a burndown in the mix to
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Unless you have the experiance with real life tuning and a way to tune in house not in the field stick with auxiliary injectors and a user friendly fuel box or spend the money for a proven setup.