[Jack21]

Not being a Cleveland buff I'd look at it this way. This Cleveland is going in a Mustang, not a Cobra. Maybe a stroker, and maybe not. Probably a warm street motor.

Remember the complaints about the Clevelands were, as mentioned above, no mid range torque. Worse in a heavy car like a Mustang. Not enough engine for the airflow.

For a street motor, look at the Aussie C3V aluminum heads from CHI (or Edelbrock if you want to wait). The C3V's should put the mid range torque in the street driving range.

For a race motor, or a big stroker that will use the flow (Dart 9.2" deck block 4.125" bore x 4" crank = 427 ci) use the Blue Thunder aluminum heads.