Hi linc the toyota box is a great box a lot closer and more even spacing than the datsun 5 speed (unless you can afford and option box) with the dellow kit all you have to do is unbolt the front bellhousing and bolt on the new dellow adapter bellhousing change the clutch and spigot bush. the gear shift is back a little further than the standard datsun box around 30-40mm from memory. the speedo cable fits up no problems you will have to remove the standard datsun gearbox mounting plates (humps out of the tunnel with bolt holes)and manufacture a new crossmember I used some 50x6mm flat plate and drilled holes in the appropriate spots and made sandwich plates for inside so the bolts dont pull through. A new tailshaft will also have to be made other than this I cant think of anymore work. The kit comes with most the bits and instructions so for anyone with a bit of mechanical knowledge shouldnt have to many troubles.
cheers Andrew