Spendy - New DME (ECU), New Master Cylinder, clutch master cylinder, New Wiring Harness, New Sway Bars (rear), Springs, Cooling system mods, New Pedal Box arrangement, New Instrument Cluster, New Center console(?), New Steering Wheel, probably more that doesn't come to mind.
Of course, that's in addition to the new Box, clutch, slave, shifter, trim plates.
It'd likely cost more than the car's worth. It'd be cheaper to skip the freeby and just go out and buy yourself a 2.5L 5-speed.
