I'm working on one of these too. Going to build a replica of the 73 Cuda that I bought new back then.
I have removed the molded in hood and will replace it with the dual scoop hood from the 70 Hemicuda. I'm also using the chassis from the 70, and a lot of the interior parts too. I also had to fill the two giant dimples in the trunk, from the mounting posts. I'm also going to replace the center part of the rear panel so that the license plate is sunken in instead of bulging out.
I'm just waiting for the release of the AMT 71 Duster, so I can use the engine to replicate the 318 that was in my Cuda.