Valiant to Duster disc brake/rear brake swap

If the Valiant hasn't been stripped yet, try the jiggle test for ball-joints and tie rod integrity. If the donor parts good then save some $ by using them. Same with the upper control arm bushes. Use whichever UCA that has the better parts but be aware that the adjusting bolts/cams may not want to come apart (if rusted into the inside core of whichever bushing). Had this happen to my '70 so was a huge project removing the uppers. Most likely yours will come apart. Check the sizes of upper ball-joints on both vehicles. If your Duster has smaller version, and still 'tight', it can be used on larger disc-brake spindle - but a spacer will be needed.