If you are shop that also has a dyno, sure. If you are a tuner that has a dyno but not a shop (Or more importantly tech's), different story.
That was the issue we (As a shop) had way way way back in the day when we took client's cars over to Brian's to tune. One little thing happened and we were screwed. Either pull it and bring it back to our shop to fix (Assuming it ran to get back) or have somebody drive all the way back, get tools, find parts, and drive back to Brian's while the car sat on the dyno running up a tab (It wasn't Brian's fault something minor happened). Something that takes us under 10 minutes to find/fix here easily took hours in that scenario.
For all I know Brian has guys working over there now so not saying that is the case any more, just that as a LT1 owner I would make my choice just as much based on who can diagnose issues / work on them as much as I would who can tune them. To be honest, this is also true of just about anything Pre "Mid 90s". I would say less than 10% of 3000GTs that come in here for tuning are able to make a single pull without "XYZ" needing done. If we had no clue how to work on them and only were able to tune them we would have 5-10 towed out every month lol.
Brand new cars (No matter what it is) you don't have to worry about any of that. Tune it and be done.
Jeff