Everything I've heard (from many people) the new AFR 235 Eliminator heads are probably the best 23 degree heads available.
I ended-up going with the Dart Pro-1 230s on my new 427, but I did consider the AFR 235s. I ended-up and bought the Pro-1s bare and build them up myself (saved a few bucks).
I'm probably making around 700 HP and have about as much HP as I can handle at the moment in my 2300 pound car. LOL!!!
Warren