58 pounds is a lot of drag. I did a simple test on the standard Baker 12. I mounted it on a 130# class rod and lifted up weights and slowly dropped them till they hit the ground. With this simple test I thought 31 pounds was the reels maximum sustained drag.
I like the way Gunsmoke test drags. He finds a rig with a rope hanging off it and ties the line to the rope. He then takes off reaching about 15 knots while slowly moving the lever up to a point where it is coming off smooth without any chatter. All reels will chatter when pushed to much. Beyond the chatter, they just plain lock up and either your rod breaks or your line. Keep the rod in a rod holder when doing this test. I've seen people go overboard.
Once you find the point where it is still smooth before the chatter, this is the max the reel can handle. Don't move the lever. Pull out a drag scale and see what it reads. Write it down and just don't fish the reel with any more pressure than the scale read.
I'm going to keep my Baker 12 standard. I have plenty of other reels that can produce more drag than any human can handle. If you plan on using this reel with 30 to 40 pounds of drag, you better have a 100 to 130# class rod on it. I almost broke a 80# class rod last trip. I was using 32#s of drag and it was bent over real bad. I'm surprised it didn't snap.
Keep us posted on your reel. You might want to tie a line to a trailer hitch and have someone drive down the street. Put on your harness and plant your feet. I'd hate to see pictures of you with your face covered with asphalt burn marks.
