Glidden had W-2s on his Arrow but he basically re-engineered everything anyway to get the most out of it.
Heads worked well. I ran them on my Challengers through the '80's & '90's. Went a best of 10.22 @ 131 footbraking with the heads being ported with a Direct Connection porting template kit. weighing around 2,800 lbs w/driver. With what I know now and switching to a 904, I probably could have gotten it into the 9's without much trouble.
My opinion on their drawbacks are the extra expense of offset valve gear, especially when getting into offsetting and raising the shafts for longer stem valves. Exhaust adapters/headers also added to the costs over conventional heads.
