Setting up yesterday and starting to play with measurements and the front suspension I discovered the first issue to overcome. I think I have read about it on here, anyways the radius arm mount is going to want to land partially on the trans crossmember mounts. It is not all of it though, in other words they don't have to occupy the same spot, just share it! Going over options, #1 I can cut off the trans crossmember mount and modify it, #2 I can move the front axle forward (don't like this for panhard reasons), #3 I can modify the radius arm mount, #4 I can fab some things from scratch or look for a different radius arm mount. I did notice the 80-series is using a smaller less bulky mount frame side for the radius arms.
I think I am going with #3. It is not very bad work wise, seems about the easiest to me. I only need to gain about 2.5" and I see no issues with what I have in mind compromising strength.
Cheers