Depends on how anal you might be but in a nutshell...
You don't! You fly out and inspect it personally or you'll kick yourself for not having done so when it arrives w/ something you're disappointed in. Even if you have someone you really trust (who is also a car guy to your same degree) do it for you, they must be as anal as you. And must be someone you really really really really really trust. Even then, be prepared to face some disappointments and not hold it against your appointee.
Plus, after putting in the effort to get there, you'll negotiate harder by being overly critical and a bit cranky (which is a good thing in this case)
Good luck
