Its a little odd with the GSR, see the easiest thing to do is use your original civic harness, you are in luck if you have an EX because that harness needs the least modification.
But some people say that in order to gain the full performance potential in a OBD2 GSR swap you need the GSR Harness, I do not know the truth to that, but its something that a few respectable people have said.

secondly, you are going to need a Powesteering pump from a 98+ Integra, and you get to keep powersteering.

You need a Delsol\CRV AC bracket to keep the AC

keep the civic radiator and condenser.

you are also going to need two mount brackets, rear 99 si Tbracket and Driverside Timing Mount Bracket.

and you are good to go.