Has anyone retained stock A/C bodydropped on 20" or bigger on S-series??????

I know this topic has been brought up before, but not thoroughly answered. I saw a evaporator box that Silver Star Customs made to lay frame on 22's and was wondering if anyone else has down the same?? http://www.silverstarcustoms.com/albums/S10-on-22s/100_1303.sized.jpg

And how well did it work?? If not, has anyone used an aftermarket setup and how well does it work??/ Any pics???? I know that when I notched the blower box to lay frame on 20's, it seemed like I lost air flow. Also, it looked like the upper control arms were going to hit the evaporator box. I called Vintage Air and they didn't know what to tell me...

Thanks ahead of time.