What do you think it could run?

Late lamented Mopar nitrous guru, Monte Smith, said exactly the same thing, they didn't pull enough timing out for that size shot.
I have a friend who picked up over a second, IN THE EIGHTH! with a Chevy v6 in a Nissan pickup, with a 200 shot (before it burned to the ground).
I don't think that kind of improvement is uncommon.