360 Tune Up

Some good threads on pulleys.
https://www.forabodiesonly.com/mopar/threads/pulley-diameters.411119/
https://www.forabodiesonly.com/mopar/threads/pulley-size-for-72-340-with-ac.420375/
March makes aluminum pulleys. You can order in black finish (powder coat). So yet another option.