Thanx ddgonzal and dodgeman! I think i will leave the engine for the last, and start restoring the body for now! Thanx

As Ddgonzal says, the A13 that was used in the 1974 US model B210 is quite rare but it does not really offer a lot by way of performance improvement. The 10% increase in stroke [from 70mm out to 77mm] will boost torque & I suspect that this engine was originally installed in the B210 to maintain performance in the bigger & heavier body.

This engine is basically an A14 with a smaller bore [73mm] &, as Ddgonzal points out, the small port head.
The fact that it was replaced with the A14 after only one year must tell us something.

Having said all that, being an A series Datsun engine, it will still be a good & reliable powerplant, & if rarity means anything to you, then it would be a good choice as production A series engines don't come much rarer than this.
If it's performance you're after, then find an A14 or A15, but, as Ddgonzal has said, only the 1200 engine will be a direct replacement.

The 1974 A13 engine is quite rare, only about 100,000 were made.

It is 117cc bigger than the A12, weighs more, and is not a direct bolt-in.

Peak HP will not be greater than the A12 (they use the same cylinder head). But low-RPM horsepower will be up a little bit. About 1% across most of the RPM range.

Swapping 1974 A13 is the same procedure as an A15 (which is 7% more power than an A12). For an 1971-1973 A12 this means fabricating motor mount adapters.
Engines Swaps

For details how A13 compares to A12, see Nissan A Engine

Hi everyone! I can get a datsun A13 engine for a very cheap price almost free, but i dont seem to find much information about that engine here! Is it worth it to swap it for the a12?Please can someone tell me more about the A13 specs?
Thanks