Dellow don't offer an A series kit for the W range of gearboxes as far as I know because traditionally they were thrown behind v8 conversions.

Roughly speaking you would need to
- cut a slot in thebellhousing for the clutch fork
- weld on a ring to locate the clutch cable
- design a 1 inch adapter plate/ring to mate the box/ housing
- modify clutch fork setup to somehow attach to the adapter
- source the right size Toyota clutch plate (200mm) and machine flywheel to accept it
- machine a spigot bust to replace the datsun one
- have a tail shaft made/ modified