well, i dont have an answer, other than, ive been looking for awhile for a good pull-a-part place to pick up some axles etc for my truck, and havnt had much luck finding any. you might try craigslist for private party sales, thats what im doing
I wouldn't bother with the Tumwater pick-a-part for your needs.....they rarely have anything in the yard that's older than 1970, and when they do, it's picked clean in no time. I live just down the road from them, and go there from time to time to see if they have stuff for my 79, and pickins have become slim.
To be fair, though, they did have a 79 F150 4x4 for sale....a runner with a winch on the front of it. I think they wanted 1500 for it, but I didn't really need a new project.
Anyway, due to the small size of their yard, and the constant rotation of newer stock, I doubt you'd find anything for your '63.