If you follow the link posted they have two versions for the 383; one with the orange ecu and onther with the chrome ecu.
The easiest way to find things on the Jegs site is scroll down along the left side of the main page under Product Categories and select Ingnition & Electrical. Then select Distributors then select Mopar. You then have a choice of a kit with the harness, ecu and distributor (the link I posted) or just the distributor.
I like the way the Summit web page is laid out better than Jegs but they both have the same stuff and have a lot more avaialbel for Mopar than what is listed in the paper catalogs.