With the world 305 torquers, are self-alligning roller rockers necessary or do you need the regular ones?

 

Mine came with guide plates and studs that I had to install myself. You need to use one or the other. You can't run both guide plates and self aligning rockers, and since the guide plates were free I went with them. If you use guide plates you do need hardened push rods.

 

I used the stock self aligning rockers.