The Holley efi kit and pro dash wasn't hard to install. The coil and fuel pump need to be wired up but its pretty simple. I made a small relay panel hidden under the seat where the ecu is as well with the supplied bracket. You will need the can to usb cable to make tuning easier and to set the IAC up in the pin map.
The dash is awesome, all the accurate info right in front of you compared to the factory gauges. Theres 9 pre loaded screens + a ton of extras on the supplied usb. You can datalog on it as well.