Looks like you're quoting a twincam escort's standard ratios. 2.97/2.01/1.40/1.00 in a '3-rail' box not a single rail box.
If that is the case then I'd say $1200 to 1500 but very much dependant on condition eg gear teeth, syncro's, bearings, layshaft etc. Things you can't tell without seeing it apart or actually using in a car.
SFE