[Mike C]

6 on 6.5" is GM's bolt pattern with large center hole. Please provide pictures of your front and rear axles before we go any further. If someone has completely swapped in some bizarro setup you should start over.

Once again, what is your level of skill? Can you weld? Are you able to set pinion angle and relocate shock mounts? These trucks are easy to modify with some tools and skills and need to know where you are at.

Any 71-91 Blazer or Suburban would be a suitable donor. Or if you are going to buy wheels any 8 lug truck from 71-91 would be an acceptable donor. I would look for a mid 80's 4x4 2500 Suburban for the semi-float 14 bolt and the 8.5" 10 bolt. Re-located spring mounts and fab new shock mounts. Done. By 8 lug wheels that you like. Wind up with much newer components and heavier duty brakes.