I'm all for long distance road tours with a Model A. Our fathers (or grandfathers) did it as a matter of course. I've done several myself. Great experiences!
With that said, you should go into this with your eyes open.
A Model A is probably fairly different from anything you have every driven or maintained. For example...
There is no centrifugal or vacuum advance. You perform this operation yourself depending on speed and engine load with the lever to the left of the steering column. You "double clutch" to shift the non synchro trans. You "dial in" the appropriate air/fuel mixture with the GAV on the passenger side of the fuel tank. Plenty of other "quirks" that add to the romance of the A but can be troublesome until you get competent with them.
The car can go 60MPH, but it's not happy doing it for several days straight (unless it has been rebuilt with insert bearings, a counterbalanced crank, high compression head, etc). 45 is a good road speed. You'll probably average 40 MPH for the trip. 5 hours/day is about all you'll want to spend in the car

. So, that is about a 12 day trip. Trust me...after 3 days rattling around inside a Model A, 9 more days isn't going to seem like much fun.
There will be 5 recommended oil changes along the way. You can probably get away with 2-3. Other maintenance will be required. Read all about it here...
http://motormayhem.net/wp-uploads/2009/04/Model-A-Instruction-Manual.pdf
If the previous owner has not installed a manifold heater, you'll freeze your butt off this time of year on certain stretches.
Since it sounds like you don't have experience with Model As, and certainly not with this specific car, you may want to hold off with the road trip until you have both. Have the car shipped to you. It is by far less expensive than driving it home even if you have no problems en route. If you do have a few problems (likely) the costs can really add up. Having the car shipped is also less expensive than going after it with a trailer.
Once the car is delivered, dig into it. Learn all you can. Inspect brakes, suspension, steering, engine compression, rod and main clearances, etc. Drive it further and further from your house as you repair things that need it and gain confidence in the car and your knowledge of it.
THEN, next summer, take that long road trip.
When you take that long road trip...either when you pick the car up in Oregon or next summer...please chronicle it here. Daily if possible. It will fun for us to "ride along" with you.
Good luck!