copy cat
j/k
i am putting my 89 crx si motor mini me zc piston with lotsa goodies swap into my 91 hatch. really there isn't a lot to do. you can use the 90-91 hatch motor mounts, we are putting in new inserts. if the hatch was a dual point injection there will be some rewiring to do. we are also replacing the shift linkage inserts.
the main diff is of course the body weight unless you gut the hatch.
good luck.
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if you can only race me in a straight line then whats the point 
...91 SMF SCCA
http://www.flickr.com/photos/8341770@N07/5601083432/http://www.flickr.com/photos/8341770@N07/5601083432/ by http://www.flickr.com/people/8341770@N07/, on Flickr
I see people out there spending money on the car to improve it … If you spend half that effort just working on your driving skills, making you and the car work together as a team, then you’ll go faster – period. To make the car go a second faster on the track takes a lot more energy and money than making yourself drive it one second faster.
– the late Tom Thrash SCCA Solo E Production