I don't know how early the MW victors actually came on the scene, but the set AndyF sent me to check out in late 2008 were not std port heads with a CNC'd MW opening, but rather were cast as a full size MW port all the way in.

They also flowed noticably better at high lifts than a std port victor with the opening enlarged to MW size, and also better than the newer version where they shrunk the chambers and bowls.