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Actually in 1970 and 71 the E Body Dana 60 used the same brake line as the 8 3/4 rear axle, so your is correct although it looks a little bent out of shape like it was originally for a wider rear end.The Dana 60 lines that follow more the contour of the Dana shape are a 69 and older B Body thing.
Seems like I'd remember that since I had the back cover off the Dana in my 71 Hemi Challenger a few time back in the day... But I don't.... So I really question if your correct....