To be perfectly honest, for the work and money you are talking about putting into the car, I would sell it and buy a car that has the options you want. Brakes and power steering aren't bad if you know what you are doing, but installing an AC system into a car without one will be very expensive, try upwards of $2000 by the time you get everything and replace the parts that are sure to be worn (I am doing it now on a 70), and it is extremely time consuming and will basically require everything from the seat forward to be taken apart. If your car is truly an all manual car, than it may be more valuable to someone looking for a racer than it would be as a driver. If you do go ahead and decide to do the work, buy a complete 4 wheel disc conversion kit. You can find them for about $1200, and having new, clean, and rust free parts to work with is definitely worth the extra couple hundred bucks. Power steering parts will be easy to find, but again, the AC stuff can easily be prohibitively expensive, so know that going into it. Good luck