LSD or not

[mr-p]

Right,

After coming to terms with my donor having a DOHC lump in it, it appears that I have a 7.5" 3.92:1 open diff.

After a bit of research here & on LCB it seems that this is not ideal for this type of car, and the ratio is too low for a zetec(which may be the favoured option), what is the general opinion?

Should I start the hunt for an LSD to be better for the long run?

Also my donor came with an MT75 box fitted & a Type 9 in the boot, is there a winner in the box dept?

Mr-p