I am about to go snap a few pics of a guys car. I dont know how much is installed or not but it will at least give a good idea as to where a dealership mechanic would put the holes for the lines and such. I will post pics here later tonight. I dont know that I would set up an underdash a/c like this one was. The holes were right behind the distributor on the firewall. It was hard to get good pics and he had the hose holes plugged with something. The car is a 72 Rallye 340/auto. There is literally nothing hooked up anymore, no hoses, nothing under the dash, nada. I dont know why they put the holes there but it seems silly when you have better access by putting them where the factory did. Anyway here are the photos someone wanted.