HEY!! This is my idea!
I've already brought in one of the earlier (OHV crossflow) engines for my other Z-car, a Mercury Zephyr (daily driver wagon).
Easy swap for Ford, the OHV version sits on the same mounts as the US Ford 200 and 250 (3.3 and 4.1) L-6s. Even the radiator hoses line up.
The downside: different bellhousings and block pattern. You have to use an Aussie transmission, or an Aussie T-5 bellhousing.
The OHC and Intec versions are slightly different but can be made to fit; I'm using the OHV version as a testbed in the Zephyr but final plan is to put an OHC in one of the 280s and a hot "pieces parts" L28/L28ET in the other.
Check out http://www.fordsix.com for details, you have to sign up but they have a six cylinder forum.
By the way...these engines are LIGHT! 4.2L OHV was 330 pound shipping weight, with no belts, but with alternator, power steering, water pump, but no flywheel or bellhousing. 330 pounds also included the pallet and a 185/75/14 Aussie tire, as well as rope and tape.
Stock exhaust and intake manifolds are in that weight, throttle body, injectors, EGR, and a few feet of wire harness.
Ben