70' 340 swinger harness

You haven't said if its rally or standard harness and panel. Both are in factory service manuals through 72 models. Do not try to read wiring diagrams through beer goggles.
I've seen 2 cases where the factory wiring diagrams did more harm than good because the user didn't comprehend the drawing. An engineer is taught a method of rotateing a item when illistrating its different planes. So where in the real world the locating key in the center of the connector might be at top 12 o'clock position, it may be shown in the drawing at 9 o'clock. The wire locations are rotated accordingly.
If you need to rotate your drawing 90 degrees to make it look like what you see in the car, do that.