70 dart with 73 brakes issue

So here my issue I have 70 swinger that I put brakes off of a 73 dart or so I was told (caliber are pin style) so I got my brake lines for a 73 and it is not going to work without being unsafe my line is 16 inch long and the one for a 70 is around 11 to 12 but I was wondering could I just swap my hangers over for a 70 style or do I need come up with a new plan ?