Nick,the engine x-member is the easy part.....There's quite a few other things to take into consideration. the steering/header clearance seems to be the most common problem.
I've gone the whole nine yards with mine(Mustang II,new gearbox x-member etc) so my pics wont be relevant.
Hang tight, someone with more info will be along soon.....You're a bit like me in the fact that when we're on-line,nearly everyone else is asleep!