Mondeo V6 box gets my vote, and it bolts straight up, you just need the right clutch and flywheel combination as the cossie flywheel has the ringgear in the wrong place for the starter.

I have the clutch and flywheel you require for sale if you want it, 150 quid including delivery to UK mainland.
(came out a mondeo with a transverse YB but is unsused as they never finsihed getting it running)