B16A Gen 1 also came in the RSi DA 'teg according to Honda's website.
Nice coverage, I'll just add that treated properly, this has to be one of the toughest motors I've seen. 283,000kms on my original, unopened B16A.
Some Extras:
B16A2 Dizzies will only fit a B16A (gen 1) if you cut out a recess for the dizzy tang - it's located on the other side.
B16A2 engine mounts will not work with an EF regardless of what anyone says (and I mean EF, not ED which they definitely wont work with).
Waterpumps are interchangable (ty Tinkerbell and Robbie @ Hanny's)
To get parts for a gen 1 - Strong for Honda in NZ are a good starting point - or ordrer from Japan - they still have proper rad hoses etc and WILL tool up the dies to make you brand new engine mounts (EFs only).
Will check all my notes when I unpack my bags and boxes and find my gen 1 maintainance notes.