for something as simple as PI heads and 270cams just do a mail order tune. that is the easiest way, i'm pretty sure that you don't have anything else that would cause an issue with a mail order tune... well inless you plan on using that nitrous kit then i'd say get it dyno tuned. other than that just get a mail order tune, your mods aren't enough to make it so that a mail order tune would be hard.