I have a complete torsen swap and a 7" open rear end
 

I have a complete torsen swap out of a 2002 for $850
this includes the torsen II(which is stronger than the torsen I which came in some na miatas 94-95)
the axles
and the driveshaft

I also have a open 7in rearend out of a 2001 for $250

Does the open 7" include axles and driveshaft?

no just the rear end

does the "complete torsen swap " is ready to be swap in a NA 1990?

What ratios are they?

yes it is ready to be put in. 4.30 gear