First off, for a long haul, I would ask that he be given a Haynes of hay that had been soaked for a minimum of 40 minutes. This will help him keep hydrated.
Ask whoever you are getting him from, to pull his back shoes.
As far as turn out goes, I would have him on his own or with one of the other horses, turn him out with that horse and just let them be. Let him be able to see the other horses and slowly introduce them to each other.
Give him a time to learn to be a horse in a herd and to let down from racing fit before starting to work him.