best is to get programmaple ECU, so you can tune your engine. Megasquirt is maybe the cheapest choise. you can get pretty good tune by yourself, when you use wideband lambda to check the mixtures, then just modify your Ecus programming accordingly.

if using just new chip, then i would take car to tuner with trailer. and again to check mixtures when drived 2-5k miles, if you dont have Air/Fuel Ratio gauge.