First off, that is not a '63. It's a '60 - '62. No coil springs in the front on 60-62 trucks.
You can use the early frame under your '65 but it take some time and fabrication skills. Measure the width of your 65 vs. your parts truck.
Your '65 look like a good truck. Why not run it until you save up for the short bed stuff?
Are you in Anchorage?
