From the photos they are two different hook ups , one the valve and hoses in the photo is for a factory A/C ,  which should come out were the fan motor that is sticking out the fire wall , the compresser you have in the photo is a dealer installed A/C unit , (see hose clamps ) you will find two holes in the fire wall someplace , unless somebody put that engine from another car and left that compressor on it ,  "note " factory A/C cars have the blower motor inside the car ,

The dealer installed A/C does not have the combination valve , the unit that used this system has a expansion valve built on to the whole assembly that goes in/under the dash , you can try vintage air , they make some nice small units that will fit in the dash , or find a wrecked pinto nearby that has the whole factory set up and swap it over , done it a few times , take a whole weekend