Details are this. you remove the metal plate that goes in between the motor trans

you weld a plate on with the correct bolt holes that is 1/4" thick out of aluminum. now the trans bolts to it. you make sure you use all the bolts and tht all the welds are strong. then you're in business.

throwout bearing depends on which clutch you use, you may have to drill some holes in your flywheel to use the 350z clutch, or use a custom throwout bearing off of a pulsar ( most commonly used) and use the sr clutch. or a twin plate.

the gear ratios are closer and shorter than the 5sp that the 240sx / silvia has. 6th gear in this trans is equal to 5th gear in the 240sx. that means 1-5 is MUCH closer and shorter, plenty of gear selection for drifting.