I used 71-72 spindles, tie rod ends, brakes, etc. on my '68. If I were to do it again, I would get a complete 73-87 front crossmember, and swap over the whole works.... power steering, engine mounts and all!
I have a 67 rolling frame I will perform this exact swap on... some day
I think in the end it would be cheaper. 71-72 ball joints were $60 or so a piece.