Brake Bleeding

[cst350]

I have read as many threads as I could find on this. Unfortunately there is a lot of conflicting info about the proportioning valve and the sequence of which corner to start with.

My truck is a 69 but upgraded to disc front and drum rear, all new parts. I only have the service manual for the 69 (all drum) so it is not helping much. I have bench bled the new master and the proportioning valve I have has a pin that can be pulled out but not compressed. Should I shim the pin so it is all the way out and do all four corners starting at the passenger rear?

And, I have a vacuum pump. Do I need to depress the pedal before I use the pump?

Thanks for any help