Fitting Boxer Motor in Old Racing Car

[P34Fan]

Hi there,
I'm playing around with an old Group A sports racing car and thinking of putting a 1.6l boxer motor in it.
Could someone please provide me the dimensions Width x Depth x Height so I can see if it will fit in the chassis.
If it does then the next questions is, as I would like to use a Sud transaxle, what is the best model to use and what are the best mods?
Thanks for any help rendered.
Kind regards
Ken