Additional Parts
Other parts you will want to make sure you have besides a complete engine+tranny.

Shifter:

You need either 92-96 Prelude shifter box and cables, 90-96 Accord shifter box and cables or 97-01 Prelude shifter box and Cables. I recommend the 90-96 Accord setup.

Speed Sensor:

Make sure your swap came with a full speed sensor. For 90-91 ludes it's plug and play. 88-89 ludes have two solutions: first is to remove the VSS from the top of the assembly and simply stick the end of your speedo cable in there like this:

Getting it to stay in place will be an issue obviously. Another option is making a hybrid speed sensor using parts from both 88-89 and 90-91 speed sensors. DETAILS HERE

Power Steering Line:

If you plan on keeping power steering you will need to send your stock P/S pressure line and the bit of line shown above to Sean at http://www.1funryd.com/ and he will have a hybrid line made for you.

Manual Tension Conversion :

If you swapping in a H22 it's a good idea to do a H23 manual tensioner conversion as the auto ones are known to fail. You can buy a complete kit to do this HERE and the write-up is HERE.

Also there is a new product that makes this process easier by simply replacing the auto tensioner with an adjustable one:

Get it here: http://www.kstuned.com

Prelude Rear Mount Bracket:

Make sure your swap came with a 92-01 Prelude style rear mount bracket. If your swap came from an Accord it will have the wrong one, and it will not line up with the rear mount.

Fuel Rail:

Make sure the fuel rail you use has the pressure line attaching on the passenger side (Right). The picture above shows the WRONG rail, with the pressure line attaching on the drivers side (Left).