If I were you (and not me) I would put your best rebounder at C then field your four best perimeter defenders, and match them up against what you suspect is his/her best shooters. Then play 1-3-1 zone.
i.e. Your best perimeter D guy should play the guy who scores the most for him . 2nd best D against 2nd best O and so on.
To counter a 2-3 run something slow paced since he is better. If you have two guys who have good JR play princeton. Sure your inside game will be hampered, but your coach will make adjustments and you'll shoot more 3s as the game goes on. Hopefully you'll be close still and may have a chance.
If you have no good passing bigs and no good JR guys, I would play patient to keep the game close and it is well balanced (meaning easier to make adjustments mid game), or run motion and pray your shots fall. I don't know your team so I think this covers all three scenarios.