Edit: 1970 C10 SBC 350 stock.
so i just installed a new harmonic balancer from NAPA and new underdrive pulleys. Went from a single to triple to get ready for AC and PS. My old balancer was bad.
I used the proper puller to remove it and the proper instillation tool to install it. I also torqued the balancer bolt to 60 ft lbs and the pulley bolts to 25 ft lbs. From research this seemed to be correct from research I did.
Here is a short video. Sorry I don't know how to embed the video.
https://youtu.be/KvmisCygQbA