Put it on what? The floor? Be more specific if you want a quick answer, dude...
If you're asking can you slap a B20 block into your Si without anything needing to be changed, no you can't. You've got to plug the VTEC oil hole on the head, run an external oil line, drill out the head to fit non-VTEC dowel pins (or buy some Golden Eagle LS/VTEC dowel pins), get a non-VTEC headgasket from a B20, set up a PCV system for the B20 block, and so on. It's the exact same thing you'd do for an LS/VTEC, except you've got to set up a PCV system.