Re: converting to power brakes and steering
You will also need the steering shaft (it is shorter for the power box), the pulleys, and hoses. I haven't heard of any problems running a 76/77 box and pump on a 351w, it should rin just fine (I am assuming you mean a Windsor engine). I just swapped in front disc, about 4 months ago. I have no need for a booster. It stopps much easier. In 2 weeks we will have my brothers 4-wheel disc bronco running. We will find out then, whether or not he actually needs the booster or not. You could Do-It-Yourself on the disc brakes for between $500-1000. The Chevy conversion will cost approx $250 for the front and you could do the rear for about the same. See "www.Bronco.com".
Hope This helps