I have this from a customer coupe scheduled build date 01 July 64 Dearborn. Unfortunately I did not take the upper hole but I can tell you it is in the same location as any 65. What changes is the hole in the firewall. Here there is one large hole for two hoses and wire.
The whole AC install looks factory. i.e. when looking at sealant marks but cannot say for sure 100%. No trace of a holesaw or from a file on the firewall, just a clean cut. Considering the location of this hole on the firewall, it is difficult to make it with engine and pedal support installed, feasible but not easy. This makes me think the firewall hole was drilled before the power train was installed.