I picked up a '76 3/4 ton chassis for $200 the other day and added some fancy new hubcaps.
I know I'm forgetting a couple small things (like the seat I had from another truck), but it's been a get-in-and-go daily-driver truck the whole time and hasn't really needed anything. I put about 5,000 miles on the old 283, and I've put another 2,000 or so on it since the 250 was swapped in. It's been a great truck so far!