1973 Dodge D-200 Time to hang a new harness

Hi, Any recommendations on where to get a new wiring harness... poor old Gladys is starting to melt down and the circuit panels are fried. She has an early 90's 318 engine... not sure the year, (duh, should have written it down) but my research online would say a 5.2L 8 cyl. The guys at the local shop are researching too, but our last conversation had them pricing out yet another cobble, and I don't want to keep throwing $ into fixing fixes as old wire just melts somewhere else. Obviously, I am not a mechanic... but I still love my truck and would appreciate knowlegeable help... Also, if you have done this job before, how many hours can I expect it to take with a knowledgeable wire-guy?