http://www.racingjunk.com/post/92317...ictor-CnC.html
Also a REALLY good head for 623's is the Dart Big M CnC ported, .
or the Dart 360 cnc ported to 385 cc, . .
that's if you don't use spread port heads, .
The Edelbrock Super Victor will smoke the merlin intake, ..
the ProFiler Sniper intake would be another good choice, .. ..
Curtis