How to train upper body like a powerlifter??

I have a big and strong lower body. I can squat 450 for reps but when it comes to upper body not so much. I can bench 225 twice on a good day. I can get upper body to grow but strength responds slowly. A forum member suggested i train upper body like a powerlifter. Is this essentially high weight low reps and long rest in between?? Should i train upper body like i do legs, i mostly do drop sets for squats. For example 10 plates on bar then 8 then 6 then 4 then 2, no rest in between. So one set is actually 5 sets.

How to train upper body like a powerlifter??