It's been done! Check out JC's X-flow 200 conversion and also the Crossflow Chronicles in the Tech Section. All the answers are there.
Basically, it takes too much work to easily and reliably mount the X-flow head to a 200 or 250 US block at present.
It's part of a long term plan I've had since 2003, but its not a realiable proposition.
Resons are
*the US 200/3.3 is over 1.64" inches shorter,
*1.375" narrower at the head gasket,
*has a narrow lifter gallery than the Aussie X-flow,
*and anyone of the four the distributors commonly used from 1964 to 1984 foul any alloy head intake manifold, custom or factory.
*The water flow is the wrong way around,
*and the cam is different
The US 250 six won't have any issues with the distributor, but there are still five strikes agianst it.
In difficulty, its about as hard as putting 426 Hemi heads on an Chrysler RB 440. Can be done, but it requires a lot of special machine work.
The proposition of doing a whole Aussie import engine has only three issues.
If its an Aussie engine, it has a transmission pattern like this,
http://img.photobucket.com/albums/v223/ ... 8834lg.jpg
which is slightly different to any US 144/170/200. This means you have to use the Ausie C9 bellhousing and a C4, or the Aussie Toploader or T5 bellhousing, which is rare, but not impossible to find
All American 250's and some later US 3.3's made from 1981 to 1984 have a pattern like this.
http://img.photobucket.com/albums/v223/ ... 0171lg.jpg
They don't match up to the Aussie one, so you can't use the US T5 or AOD or any Ranger/Explorer/Mustang 4-speed auto or other kind common modern overdrive transmission. Bummer!
The rest is a chinch. The engine is narrower than the 250, only a few 16 ths wider, and fits with stock frame mounts to most US I6 Fords.
