Step 8: HVAC
For a street car you may want to think about having AC. For a race car you should run a heater as a backup radiator.
You can reuse the stock AC with new compressor and lines. Or if you want, you can build a complete system. Vintage Air can help you with whatever you need:
Vintage Air - Inventors of Performance Air Conditioning - www.vintageair.com
They sell cooling/heat units, as well as a complete line of compressor and all electrical accessories. They send you the lines. You cut and mockup the lines. Send the lines back to them and they'll crimp the lines for you for free.