Vintage Air comes up a lot on this forum and others. From what I've seen from other posters it seems most shops charge around $1,000-$1,500 for the job depending on how much clean up/detail etc the customer wants done.
I've installed two of these kits. They're not difficult, but do take time by yourself. It is a lot of work, but since you have no overhead, and this is likely a friend or acquaintance? I think 800-1,000 is more than fair (the kit alone is around $1200 no including the charging, belts, or pulleys you may need, depending on car, I already had an A/C car so I was set), so overall, adding A/C is expensive. I don't know if you've ever installed one before, but be sure to let the person know that their cooling system will like NOT handle the new VA kit.
You're supposed to remove most of the front fascia, but I got away with just removing the grille, center bar, and hood latch.
I had to upgrade my C10 from a 3 row to 4 row heavy duty radiator and 7 blade clutch fan (what the truck would have come with if it had factory A/C). I also had to upgrade my mustangs cooling system. Overheating seems to be the #1 complaint I read on here after installing A/C, so just be prepared for that.
2011 Mustang 3.7L Premium Pony Package
2015 Silverado 5.3L 2LT DC Z71
1965 Mustang C Code Coupe 289/T5/3.25
1967 Chevrolet C10 350/700R/3.73
1967 Firebird 400
Last edited by 65 Pony; 12-03-2014 at 11:30 PM.