360 Swap for the 65 Dart

No. The 318/340 share a common oil pan, but the 360 has a smaller rear bearing so the pans won't interchange. For your application you need a 360 passenger car, center sump style pan.
Also, and I don't recall if anyone mentioned it, you'll need the dropped center link to clear that pan. A few of the 65 and a lot of the 66 slant 6 equiped cars came with the dropped center link, but you'll have to measure it to be certain. If I recall correctly, the drop should be 1 5/8" .