Daniel,
Here's a photo Tara sent me just last week as I too was looking at the Hall kit for the upper rear of my '74. The photo actually shows the complete Hall bracing kit of all four pieces, the upper rear is in the upper right of the photo (the 5 pieces). As previously stated in the thread it's a weld together in addition to you existing camber bar and assumes you currently have a square steel camber bar.
In comparison the Precision Proformance unit is a complete easy 'bolt in', so a lot depends on what level you assign to your time or the cost of having someone weld it altogether.
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