I did the homework myself for the end result in my car. I used the part of Classic Air's kit for an A-body Mopar that goes behind the firewall. It's a "bolt in" to the firewall and has all the outlets coming out where the stock blower motor would have come through. Since I wanted to clean up the firewall a bit, I re-routed the outlets to different locations. You can buy the "behind the firewall" part or the kit by itself if you want.
Then I found a company out of L.A. that has new, replacement condensors and I bought an OEM Mopar drier for a Dodge Intrepid ('04 I think). Then I'm using the stock 6.1 OEM compressor and have a local custom hose guy (makes hydraulic, oil, fuel, AC, rubber or metal) I'll use so all my hoses will be custom length for an OE look. I went this route so it doesn't look like I used a generic, aftermarket kit but rather an OEM look. Oh, and I found the manufacturer of the aluminum adapter fittings for the compressor. These are the fittings that everyone else (like Bouchelon) sells after marking up the price. My water and air valves are all electronic, but I haven't decided on controls yet.
I did all the research for my system during the big, economic hey-day when a lot of these companies had more business than they could handle. As usual, I had to deal with attitudes (my pet peeve) and people who expected you to just order up and not ask questions about the product.
I got the best service (willing to sell a "partial kit") and price from Classic Air. Pretty much all the people there were gracious, helpful and cooperative. The Vintage Air people were pretty arrogant, no matter who I talked to. What I found with Bouchilon was they're just re-selling stuff from elsewhere. I won't ever call them again after the son there lied to me about an "export only Jeep" oil pan. I knew it was a standard, stock 5.7 Jeep pan and when I suggested that, he got pretty "agitated".