Front Suspension Upgrade...
all a body torsion bars are the same. i used 74 dart torsion bars in my 65 barracuda with out changing the lower control arm. the diameter (spring rate) is different, but that's because i went from /6 torsion bars to HP V8 springs (.890)
UCA & LCA bushings are also the same across the years. differences come into play with ball joints/idler arms and centerlink lengths/directionality and angles.
sb