Basic 6th gen Civic B-series Swap info
Assuming you have already purchased an OBD2a (96-98) B-series swap, here's some basics on what else you need to get it in your car.
Unless you got a b16a2 from a 99-00 Civic SI, you will need to get 2 mounts from this setup. The rear tranny mount and the driver side mount can be had for about $70 for both pieces. In addition, if you wish to use AC on the swap, you will need a 96-97 del Sol AC bracket. This goes for about $100. check local junk yards, or online OEM parts stores, or your local Honda Dealer may have some of these parts available. These are pretty rare parts so you may have a hard time locating it.
On the driver side mount, use the mount from the SI and reuse the stock civic studs...