well price matters what you find...a good motor to get is a 96+ civic ex motor because the plugs plug into each other on the distributor...u used the stock crx engine wiring harness and use the ex distributor.
so basically all you need to find is a the head and block from a d16z6 you use the crx si intake manifold wiring harness tranny ecu evverything....
at least this is how a friend of mine did it and his car runs good...

just my .02