Its all plug and play in both cars the ls will drop right in the eg you will need to use the dc mounts in the eg including the rear trinagle mount. The ls wiring harness will plug into the eg harness and you will also need to use the ls ecu.

As for the DC the motor will go in useing the stock mounts and the harness will plug into the DC car harnesss but you will need to wirer the DC car harness for Vtec that is all you will need to do for it to work and use the gsr ecu