E-Brake help please
There are two different e-brake cable arrangements I'm aware of. One that uses equal length rear cables with a long intermediate cable that runs in a "U" shape and doesn't have a housing. On that arrangement each end of the intermediate cable is connected to the rear cables, one end on each side. The "middle" of the intermediate cable is attached to the housed cable that runs from the e-brake handle on one side and that J bolt on the other side in the front.
It looks like this on each end, one bracket on each side for each rear cable
And here's your J bolt, on the right hand side attached into the torsion bar cross member, holding the intermediate cable.
It fits into a slot in the crossmember, just to the outside of where the front frame rail comes in
The other arrangement uses two very different length rear cables and uses an intermediate cable that runs just down one side and has a housing. That version has both rear cables attached to the intermediate cable on the driver's side rear, with one end of the cable at the front of the car and the other at the rear.
This is what that arrangement looks like on the driver side frame rail at the back, notice the bracket is for both cables (only one is installed here though)
It doesn't matter to the brakes or the rear axle which arrangement is used, it only matters to the car. So, yes, leave the '73 arrangement on the '73, it doesn't matter for the rear axle. You just can't mix and match cables.
There are two different e-brake cable arrangements I'm aware of. One that uses equal length rear cables with a long intermediate cable that runs in a "U" shape and doesn't have a housing. On that arrangement each end of the intermediate cable is connected to the rear cables, one end on each side. The "middle" of the intermediate cable is attached to the housed cable that runs from the e-brake handle on one side and that J bolt on the other side in the front.
It looks like this on each end, one bracket on each side for each rear cable
And here's your J bolt, on the right hand side attached into the torsion bar cross member, holding the intermediate cable.
It fits into a slot in the crossmember, just to the outside of where the front frame rail comes in
The other arrangement uses two very different length rear cables and uses an intermediate cable that runs just down one side and has a housing. That version has both rear cables attached to the intermediate cable on the driver's side rear, with one end of the cable at the front of the car and the other at the rear.
This is what that arrangement looks like on the driver side frame rail at the back, notice the bracket is for both cables (only one is installed here though)
It doesn't matter to the brakes or the rear axle which arrangement is used, it only matters to the car. So, yes, leave the '73 arrangement on the '73, it doesn't matter for the rear axle. You just can't mix and match cables.