47-55.1 A/C heater help

[hogfarm]

I am upgrading the A/C heater combo in my 54. The old system was a Air-Tique vacuum operated valve system that did not work. I have looked at the Old Air and the Vintage Air stuff. I do not want to cut another big hole in my firewall. Looking for some advice as to what is the best system for me to fit my truck. I like the bulkhead fitting, and electric valves. I have included pictures of the old system