well, depends on what mounts you have. But if you have an offset 2 bolt mount on the gsr, then all your mounts will work minus the rear T bracket on the back if you still have the mounts from your D mounts.(torque mounts won't work off the D). You'll need one from a 99-00 si. Shift linkage will be okay. You can't use the gsr harness since your harness goes all the way throught the firewall and is 1 piece, while the obd1 civics and the integra harness's are 2 piece and the engine harness meets at the strut tower where it unplugs. But you will have to modify the harness you have and wire in a few things, and extend a few existing wires.

This should get you packing
http://www.phearable.net/tech/