Because you say Datsun instead of Datto, I'm thinking you're in the States. As for a rebuild "kit" in general an A12 won't need anything more than rings bearings and a gasket kit. My coupe has been raced for 20 years now so I get individual parts as needed. The Fel-Pro gasket sets can be had at the big name auto parts places as can the rings bearings...........keep in mind the A series engines were in production into the 80's so stuff is still common. Now if your planning on boring the motor out or anything beyond a slightly hotter cam and a weber 32/36 etc. Just go with an A14 or A15, I still have the A12 because it keeps the car vintage legal.

Let us no where you're at, the majority folks on here are from Australia & New Zealand but there are members from the Portugal, USA, Malaysia, Pakistan, South Africa, Zimbabwe, Canada, Japan, Costa Rica, Puerta Rico.................and a whole bunch of other places around the globe.

Tom