Lots of head scratching but not much progress. Ball joints from Speedway would not work for me. Upper fit the spindle, but it was to large to install in my upper control arm. Lower did not fit spindle at all. So I am returning the ball joints and the Spindles. There is no way I can see how to use any new stuff on what I have.
SO the plan now is to check Strange, they have a 10 inch rotor hat listed for Spindle Mount wheels. I will see if they have a Caliper they recommend for the Rotor and then see about fabricating mounts to my aluminum spindle.
I did find a date code on the front Koni shocks, 1-73. So that matches the build date on the chassis.
Still working on assembling the transmissions while waiting on parts.