help need good info on 3/4 ton disc conversion

[Rooster's 67]

need some help/info please, 3/4 ton disc conversion
I got a friend that we are going to convert his front suspension to discs, but he wants to do it on the cheap. it has the 8 on 6.5 bolt pattern, what donor vehicle do we need to keep the 8 on 6.5's and go to discs?

3/4 or 1 ton components?

I am believing but am not sure that we can use the 73-87 1 ton control arms, spindles,rotors and calipers since they have the 8 on 6.5 pattern.

Forgive me if this has been covered as my searches found only 1/2 ton conversions which i know well.

Thanks in advance
Spence