That setup requires non A/C pulleys and a water pump with the inlet on the driver's side instead of the passenger's side.... so there will probably be some different parts required depending on what you already have, but there should be no fab work necessary. If you're going to spend nearly two grand for a dual quad setup it seems pretty insignificant to spend another couple hundred on the correct pulleys, brackets and water pump housing to keep your A/C.
If it was my car and I was going to spend that kind of money, I'd go to a good dual plain single 4bbl intake and a FAST fuel injection setup. No change required to keep your A/C and it will be much more driver friendly.... but that's just me. Its your car so you the only person you have to please is yourself. There was a day when I would have gone the Max Wedge route too, just to impress my buddies...... but I've grown out of that phase of my life. I'd much rather have a good running, reliable build, that starts easily and is street and driver friendly. Must be getting old, I guess.