57's need more compression.Don't always go by the cam manufacturer literally.they want to sell cams.Lot's of cams are boltin...................they are just not letting you know they won;t come on till 3500 and die at 5000. It's been proven that 48 se 204 and tw222 are about the best in a stock 96...........
I had the 37H in mine and really liked it. My dyno sheet is in my photo album if you want to see how she performed. Good pull down low and didn't drop off like the 26's do. Agree that the higher lift ones need more compression and you'll be frustrated on the bottom end.
As most have hinted to, the 57 will lack the low end tq that most people want for a bagger. If you don't ride much in the low rpms, then maybe the 57 is a good choice. I put 48's in my 103 and I'm very happy with the results...