Originally posted by sxecrow
You can also swap in a B series motor if you get the correct motor mounts, I believe. I know the S didnt come with a VTEC motor, so the mounts wouldn't hold a B series engine ... I dont know too much about the subject though. Perhaps someone else here does? 
You're right. you don't know much on the subject. Misleading others is bad!
All D series from 92 and up ahve the same motor moutns. S or Si doesn't matter. You could slap in a 5th gen CX hatchback engine if you wanted to. I know for a fact that my 93 sol S chassis was wired for vtec from the factory. I slapped ina d16z6 and vtec worked without any extra wiring. It's the same as a civic dx. Same options, same engine, same everything.
And if you wanted to keep it obd2, like your 96 is, you'd have to maintain your current wiring harness to slap a B in there, or make sure it's an obd2 engine, and that it's not one of the ones that has the lockout on it.