If you treat it just like the popular A body disc swap, then yes it will fit.
In simple terms, you WILL need the upper control arm from a 73-76 DISC brake A body car because all B body cars use the larger upper ball joint. ALSO, the 73-76 A body cars with 10 inch front drums also used the larger upper ball joint and control arm.
If you use the appropriate upper control arm along with the B body knuckle, drum, brake hose and lower ball joints, everything will bolt up. I did this exact swap on a 76 Dart to gain the larger bolt pattern. I replaced the left hand thread lugs though.