Believe it or not, Year One. I recently purchased a complete wire harness for my 73 Roadrunner, and its spot on!!!! correct wires, colors, wrap, tags, and printing. The big ticket is the bulhead/fusebox dash harness with guages, about 1/3 of your total price.
I suggest you do it when year one is having a online sale, i did it when they had a 30% discount going, and all total for the engine, dash, and rear harnesses it cost about $1,600. There are a few harnesses that are not available, such as tail lights, rear speaker, seat switchs.