My friend and I our currently finishing up my Painless harness in my '69. Overall it's not a bad setup. I bought the muscle car harness because I wanted it to mount like the stock one, with a removeable front harness (like stock). I guess if we would have left it stock, it would have dropped in with little problems. With the way we modified it, by adding 14 extra wires in the bulkhead connector, it has taken a little more time then normal. Should be trick and almost no wires showing when done. Good luck.