I'll agree with Frank,
For the dollar and at the size you need, that Canfield is hard if not impossible to beat and it costs less too. John at Canfield is a firm believer in maintaining good velocity in the ports and doesn't go to city sewer sized ports to do it. They move lots of air for their small size and keep a pretty steady airspeed.
Frank's suggestions of the engine sizes those heads work better with is also dead right on the money.
Ed