I just looked at my 1965 service manual. It shows the 2bbl heater hoses going over the valve cover and the "High Performance" routing over to the inner fender.
Thanks Don, Good photos. I believe you are correct since my 2bbl rt inner fender has never been drilled for a mounting bracket. I also wonder if the assembly plant may have something to do with it. Were 65 cuda's made in more than one location?