I have these 4 ports on my fire wall. nothing has ever been hooked to them since I got my car (1973 model). They don't show up on the heater vacuum diagram I have. Somebody has to know. http://i234.photobucket.com/albums/ee164/IB_Fly/Photo033.jpg
I am guessing that your car was originally an A/C car ... pretty sure that is where all the lines attach to supply vacuum to the A/C and Heat controls ...
Definitley a factory AC car. I have seen these distribution blocks on a Maverick before. Basically just routes vacuum hoses where needed. Somebody might have unhooked and re-routed yours.