make sure you have a good or new evaporator in the car, run the line with orifice tube from the a/c evaporarator along the r/s fender apron up to where the fox body condensor (or what ever)will sit.if it isnt insulated, be sure to insulate this pipe if you want the a/c to be cold.
once you have the engine assembled, all the accesories worked out like throttle cable, alternator, power steering & a/c compressor, fit the engine & exhaust into the car. make sure it all works.drive it.
see if there is enough room for the vacuum/discharge hose to fit between the engine and firewall. if there is yeah!!!, (if not, you're an engineer, and will need to do some thinking & scratching)if all appears to be in working order, fit the condensor into the car.
take the car to you local a/c fabrication shop. if you dont know one, or cant find one, drive the car to the local ford dealer and ask who does thier installations......someone see the car & will take notice and help you find a good shop.
when you have a one-off install like a 429 in a fairmont, if you could find the parts, they would be expensive. let the guy at the fab shop make & fit the lines from the compressor to the condensor and evaporator. he will have the tubing bender mandrells, hose crimpers etc to do a custom job.he may ask you to to supply some parts uch as service port fittings, switch fittings, or he may have it all on hand, make sure to use r134ac refrigerant.
the wiring is easy, just make sure you use a relay & diode for the compressor clutch, most a/c diagrams are the same basic wiring for this part, so you should be ok.
dont put a time limit on the job, if he has more time to be creative, it will most likely be cheaper.
later jb