Chassis Dyno Questions

Never used a dyno, and really don't know much about the whole process of dyno-tuning.

I just recently got my 68 Charger back on the road. While it runs real nice, I'd love to have it professionally tuned to run as well as possible. Not to mention, I'd be curious to see what kind of power my home build is putting out.

What's involved in terms of process and $$ to get a car dynoed? Do they typically swap out jets and springs and so forth to tune it for you? Do I need to bring anything other than my car? I assume it's better to go with guys that actually know Mopars?

Finally, does anybody know of any good Mopar tuners with a dyno in the SE PA (Philly/Allentown/Reading) area?

Thanks.