Drive line and rear end shim questions

[mlbrickey]

I'm currently making a change to my 70 LWB. I removed the drop blocks the PO had put on and going with 5" drop springs in the rear. It had a wicked vibration before which I believe is why I had to replace the carrier bearing. My question is should I put some angled shims to help with the drive line angle? I have read some of the previous post on the subject but, need some clarification. I have a 2 piece driveshaft. My goal is to get this rear done soon so I can tackle the front. I've managed to buy new parts for my front over the last few months. I am learning as I am going on all this.