Help with Alternator Install

Do I still need to replace my voltage regulator with a later solid state one? Also, I don't know anything about electrical; where is the voltage regulator? Thanks
No.
Just ground one of the field terminals as shown here: Identifying Chrysler Alternators (1960-1976)

While ther eyou can read about how the alternator works.

And I hope you still have the original alternator.
In some cases its worth fixing.

Before starting the engine, charge the battery with a battery charger.
explanation here:Charging Battery with Alternator - Warning