I've not performed the conversion to later IFS, I have only read about it and looked at ones others have done. I expect to do it on one of my trucks eventually.
You can have disk brakes and power steering with out performing a converstion like this one. And some will argue that your original suspension will handle nearly as good if its in good repair.
The swap is a big enough project that I'd suggest you look hard at your needs before committing to the conversion.
There are several issues with the swap.
First is that you won't be lowering the truck this way, unless you also buy dropped spindles.
Second is that the crossmember is designed to mount on a slightly wider frame, so you'll need to make sure your mounting accounts for the width and mounts everything adequately. The steering box and idler arm need to be mounted correctly too.
And the track width is a little wide. You may have trouble finding wheels that will allow mounting tires inside the wheel wells.
One last thought, the IFS is basically the same from 1963 through 1987, and a couple years more on Suburbans. In '71 disk brakes were optional, starting in '72 disks are standard. If it were me I'd look for the newest one I could find in order to have the most modern parts.
Its not really this simple, but those are the issues that occur to me right now.
HTH
