Front end rebuild....buy new or rebuild?

I'm rebuilding my suspension over the winter and swapping to discs up front. in '73 they redesigned the front suspension to use the big ball joint for all configurations. my duster has 5x4 bolt pattern, the bigger ball joints, and 10" finned drums up front. with that redesign I think it pushed the track width wider, like the '73 up disc brake cars. here's mine

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