I have been to dynos before but not for tuning purposes so I have some questions:

1. Is other programming included i.e. injector size changes, lockup speeds, !a.i.r., headers, etc. included? Is this tuning considered "dyno time" since all of that stuff can be done off of the dyno?

2. How much dyno time do you think is enough? I have a fairly mild heads/cam setup on a lt1 350 a4. The place I am considering offers tunes with up to 2 hours dyno time for 250 and is close to me extra time is 60/hr.

 

You should really call them back and ask if they are actually tuning the car or just allowing you the use of the dyno to tune yourself. $250 sounds pretty darn cheap for a dyno tune.

You would also have to ask them if they can have a "base tune" ready for you when you get there that includes changing all those constants you have listed. It wouldn't take them long.