H23 did come in the lude si's, but the in the 99 accord wagon's i believe there was a h23a vtec model engine (people also try to make a h23 vtec themselves but it fails due to different lifts between the engines) but the h23a vtec comes factory....

http://www.osakajdmmotors.com/honda/h23a/index.html

And for the creator of this thread, if u want to do a engine swap, a good place to go through is the above site, some people may say bad stuff, but I got my jdm h22a and so far she is performing beautifully...plus the place sells motors for cheap