For the Chebby swap you can google it and get tons of walk thru info. Lots of guys have done this, me included. Here are 2 articles for the Chebby:
http://classicbroncos.com/disc.shtml
http://www.wsu.edu:8080/~i6735189/discbrakeconversion.htm
If you want to use all Ford, here is an all Ford swap:
http://classicbroncos.com/disc-f150.shtml
As for your power brakes, let me ask you a couple of questions before you order the Duff kit. #1 do you have power steering? #2 are you definately wanting the vacuum assisted brakes? The reason I ask you those is that if you have power steering, you can put hydroboost on your rig for almost more than half the cost of the vacuum kit. Not to mention, HB is more responsive and it is more reliable if engine trouble should arise. If you have the PS and want to go with HB, here is a link to the write up that I did for HB installation:
http://broncozone.com/forums/index.php?sho...amp;#entry52462
If you have questions, give me a shout. I have both F&R disc as well as PS & PB that were not on mine when I bought it. I did them all, so if I can help you, let me know.