the main thing that makes a turbo kit ac friendly is:
1. the wastegate placement, theres no room to have a wastegate pointing to the front of the car with an ac condenser radiator so log and cast manifolds have the wastegate on top of the manifold instead of the front
2. turbine placement, usually with ac kits the compressor is on the passenger side and turbine is on the driver side leaving about 3 3/4 inches between the turbo exhaust and ac compressor
check this out if you want to build your own manifold, the kit has the exact amount of bends you need to make your manifolds
http://www.rcautoworksstore.com/cut/index.php?cPath=118&osCsid=09832a38b7b4b0f28a80ab2a00eb3c7b