any motor from an integra will fit- B18B(1),B18C(1),B18C(5)

any motor from a civic will fit- D15B, D16Z6, D16Y8, B16

you can use the motor out of a CRV(B20), a Prelude(H22)

basically you have lots of options...just make sure you do your research to find out which one is right for you and your driving needs