4,0 ltr v6

Are you talking the whole motor or just using the efi conversion onto the essexv6?

You would need to check with your engineer as to wether the vehicle requires an emissions test if the engines original EFI system is removed. 
 
Most states require the emissions regulations of the donor engine to be met when doing an engine conversion in an older vehicle.

you'll need the 2.8 capri   xmember and drivers mount - that mount will bolt straight up - the passengers wont (u could use the 2.8i pass mount but u will have to make an adaptor plate.
also prob the best way to go gearbox wise is a T5 - but youll need a bellhousing from a 4 speed 2.8 mustang.
also, all of the overhead cam 4 ltrs were autos - youll need a flywheel and clutch off the earlier 4.0 exploder if u go SOHC.
You'll need a sump off a sierra - the exploder sump wont fit - the sierra one suits the capri but the exploder 4.0 block is wider so u will have to make slight mods to the sierra aluminium sump to make it work.
also the oilfilter arm will need work (or use a smaller filter)
I would go with the earlier 4.0 manual non SOHC engine
 
they will catch u on emissions - unless u go LPG

in rod we trust
 
not to worried about emission's  as i'll get rego with the original mtr then pull it out and drop the 4ltr in it..
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Ummm good luck with that one ... Obviously not worried about insuring it..