It will bolt in, but you will have some issues reusing your wiring harness, specifically the one's already mentioned, the distributor and injectors won't plug into your '92 Si harness. You can repin the distributor and cut and solder the '96 injector plugs to make them work, but I've never done it before and I don't know the specifics. You will also need to add the wires for the knock sensor and for the IAB (the secondary intake butterflies).

Your A/C system can be retained, but you will need the lower front engine mount from a '94-'95 Del Sol DOHC VTEC. It's the only mount that will bolt to a B-series engine and has the correct bolt pattern to bolt a D-series A/C compessor to it (the B-series A/C compressor has the wrong connections for the A/C hardlines and any D-series mount won't bolt to the new engine). Seeya.