BEEN THERE...DONE THAT...

Instead of worrying about whether or not you have the right donor car etc...
I would recommend that you at least consider the kit from Master Power brakes.

It's not just the spindles, shields, your going to have to grab from the donor car...to make the
system work...

I've already been through this on my 70 Coronet.
my recommendation based on my experience doing this (I did the 73-76 A-Body swap) ...

Just buy the complete kit
INCLUDING the booster and master cylinder
AND plumbing from Master Power brakes...

It's based off of the 73-76 A-body conversion anyway!

The difference is:

You can get it all from one place along with
tech support which is very good BTW...

or

You can go piece by piece and fiddle and fool with old donor cars and parts stores...

In the end, you can't do it any cheaper,
any easier or get any better results
than if you just buy the kit.

If I had to do another one, I would buy the kit
in a heartbeat...

Again, been there, done that!

Just my 2 cents... FWIW...


Best of luck to you either way!