Nice 1st car!
It seems like yesterday (1997) I bought my 1st car....74 Duster 318 auto/buckets/console
What memories and good times I had with it!.....but how foolish I was to sell it :pale:....my wife reassures me everything happens for a reason...so..:farao:
On to your concerns..
SBP lasted till 74' with the Non-Power Assist brake /6 A-bodies.
Your setup will be 5x4" Small Bolt Pattern
Disc Brake A-bodies with Power Assist had the 5x4.5" Large Bolt Pattern and got the Big Upper Ball Joint Control Arms as well....so order the small bolt pattern stuff.
Best of luck... keep oil in her and air in the tires and she wont let you down.