[Todersauce]

Hello I have been working on my 68 k20 for over a year and I started doing the same thing "just a power steering conversion." I found a axle set on craigs list a Dana 44 open knuckle disc brake front and 14BFF for out back, out of a 78 3/4 ton and used them. I rebuilt the front with a guide some one posted here and added disc brakes after rebuilding the back 14B. Nothing has been easy and the guys at napa know me and my truck because Im in there about 3 times a week. If you have a dana 44 closed knuckle drum brake front end like I did you can find a repalcement open knuckle disk brake axle cheaper then converting. It is a direct bolt in stronger tubes and better brakes I found 2 dana 44's for about $100 each.
The power steering gear box has a pitman arm on the bottom the manual has the pitman arm on the side or at least mine did. I think the power version are all the same from 70 through 80's. if you have the original 327 you may have issues with mounting a pump on your block I had a hard time finding the pump bracket and crank pulley because im cheap. But they are out there. Most everyting I used for my upgrade came from Napa. Most of the gear boxes and axle parts were made by Dana or saginaw for years and didnt change much from year to year or so i was told. I wish I could say upgrading is worth it but I havent driven my truck upgraded yet. I hope it is!
This isnt very specific but it might start you in the right direction.