If you are talking about 300zxt ecu in a 280zxt, I'm doing it with the help of SleeperZ. It's not really hard just you'll need some of the 300 parts. The distibtor, afm, and new 02 sensor, ecu, and possible a 300zx ecu harness or rewire yours for the ecu. I'm rewiring mine. Get a clitons manual and compare the wiring diagarms of the years. Basicly every year the 300 ecu's changed and so did the harness so its a must to get all the same years. The distibtor you'll need to take it apart and put the 300 crank angle senor and disc in you 82-83 distibtor. The hardest thing will be setting up the 300 harness or rewiring you 280 harness but it can be done. Talk to SleeperZ he can help you more then I can.