Im confused on the whole CRX dash being in a Civic and what wiring harness to use.

I have a 91 Si and used my harness for my B16A and works fine, but im eventually throwing my motor in my new shell which has a crx dash in it.

Should everything be fine - harness and motor with dash wise ?

 

I am a little confused with your question. As far as the dash/cluster goes it will work as normal. But if your putting your B16 into the other shell make sure it is wired up to accept the B16 (Ecu wise).