That alloy head pic posted by 66Fairlane looks really close to our own 250 2V head, but in Alum.
Here's one question I've been meaning to ask for a while. Whenever I read about Falcon 6cyl engines in the US, I never come across it. And that's what I'm guessing that the Falcon 188 and 221 must have been purely for our own Falcons here in Aust. They were available roughly in 66,67,68 and 69.

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2003 Falcon BA XR8 Ute.
1972 Falcon XA GT.
1970 Galaxie 500 Sportsroof.