Looks like they did a better job of the port entrance/exit than they did with the BB head.

I am a little puzzled why they cost $320 more than the BB heads though.

If you open the exhaust exit, won't it be out beyond the size of most headers?

I don't know if it's just the pics or what, but the roof of the intake port, adjacent to the guide boss, looks much more "normal" than the Edelbrock head.