wiring harness

My suggestion: Lay out yours. A piece of plywood is handy. Murray's suggestion is also good. Print the diagrams from the Dodge service manual.
I can tell you
a. Plymouth '68 A-body is wired different enough from a '67 they can not be directly interchanged. Dodge is probably the same.
b. There's not much difference between a '67 /6 engine harness amd a v-8 harness.