Classic Industries carries an OER reproduction pedal assembly. All of the OER parts I’ve used have been excellent quality and fit and relatively reasonably priced.
Check this out.
https://www.classicindustries.com/product/1972/chevrolet/nova/parts/k1107.html
Check this out.
https://www.classicindustries.com/product/1972/chevrolet/nova/parts/k1107.html