The guy who's car I bought had A/C and a turbo/intercooler somehow. I've never been able to find photos of it, but it's apparently possible.
Look into what Dinan did back in the day with their turbo setup and maybe you'll find your answer. I have a Dinan brochure somewhere around here. If I can remember and there's some neat info in there, I'll scan it at work and post it tomorrow.