In my experience tapered end towards the front. Use chalk/paint to mark the yoke clocking and direction of the driveshaft before removing it. Same for the slip joint it applicable.
Besides that thread I posted I know there is another one in here somewhere but I can't track it down. The brown truck in that thread was owned by a member either here or on 67-72.
Here is a link to that site with some pics as well...
Welcome. Here is a related thread with some concepts and pictures. @HotRodPC @bucket
https://www.gmsquarebody.com/threads/questions-about-turning-a-burb-into-a-4-door-pickup.40579/
We used to be a Metabo dealer here at my job and we put their stuff to the test in our shop for repairing our rental concrete forms. They took a hell of a beating.
I believe the Eagle GT's came on the Monte Carlo SS's. They were great tires but sucked in any kind of wet conditions. So the GT+4's fixed that problem.