Every 670 owner I meet has had a good experience with the rifle, a gunsmith I knew said the barrel was a bit heavier than a 70 in the chamber and a bit forward from there but I haven't measured it. I put a good recoil pad on Ol' Ugly years ago and it worked well with Even Uglier today.
Thought pretty hard about a Shilen barrel and a target stock for Ol' Ugly, Scorch. Just didn't make sense. Adams & Bennett seems like a good alternative, they're not match grade but they're quite likely better than factory. Mebbe the A&B barrel and a Boyd gunstock would get Ol' Ugly back in the game. Would probably have to quit calling her Ol' Ugly.