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Drop boxes won't help the rear driveshaft. Fit the suspension and flex the car up on a travel ramp or similar and check the driveshaft extension, you may need a rear tailshaft spacer if it's over extending. Rear driveshaft angles will probably also be an issue being a shorty, you will most likely need the tail shaft modified to fit a double carden joint.
Diff breathers will need to be extended and you will need an extension bar for the brake bias valve.