Hi Anjin so did you buy the 57 yes its rusty but I also saw on the rear spring hangers (to lower it)the owner cut the rivets and moved the hanger up on the fram and just welded the hanger back to the frame kind of scary not much contact with half the hanger above the frame rail. Also the drag link looks like a couple of tie rods welded together so replacement parts would be hard to find would need fabricated. I would say just because its a runner but looking at the rust value wise maybe 1500 - 1700 (just my opinion) the wheels are not worth a 1000.00
I bought this 58 for 700.00 less than 2 years ago not running the owner wanted 200.00 for the wheels you see. I told him to keep them and this truck had very little rust mainly the fron cab mounts




Hope this helps
Jeff