I have a 99 Civic ex and I am about to drop a B18C1 in it. Since I will have an extra engine lying around I am thinking about putting the D16 into my dad's CRX since the stock engine is blown.

I was wondering how hard would the wiring be for VTEC and what all would I need and need to do to swap a D16 in a 1991 CRX?

 

Its a pretty straight forward swap, considering converting to OBD-1, there should be plenty of threads on both those subjects.