Tech it should be any KA from 91-93 they are all the same from all my readings on the matter.
Dont expect much in an auto anyway, trust me. I put in a basic s13 set (from a 91 as that was what was available to me) and didnt notice much of anything in my auto

And when I put them in I checked the valve lash as well so thats not it, its the powerhungry slushy.
russ put them in his and got IIRC 9rwhp I got mabey 2 hehe And that was after intake exhaust timing gutting (later replaced with HS headder), and the likes.
Yes it is 248 on each for nismo's and stock is 240i 248e.