My mirage is off the road for the winter but it does have comp on it.

When you get your rig together you should get some more on power tuning done. I would not do a long run they way it was. If Brendan does get over the two of you should be able to get 90+% of the tune done and you then can asses your confidence in it.
I for one am willing to go on a long run with a fresh built vehicle but todays builds are more complex and do need a bit more sorting. It just is not the simple carb and dizzy days anymore.
Most of what I build now gets on a race track before being driven on the street. Granted some stuff never goes on the track and some never goes on the street.