I started this as a part of the recent TV/Movie CBP, but it ended up extending way past the deadline. So I figured I'd start a new thread to post my progress. The base kit is AMT's '67 Impala 2-door HT, and my first step was to modify the body to the 4-door HT configuration:
I used the rear corners from a '68 Camaro to get the basic shape, and did a lot of filling and reshaping to flatten the trunk and blend the old and new roof components together. I also rescribed the door lines, filled in the old door break, and removed the original trim.
I used the stock 427 from the kit, mated to the automatic transmission from AMT's '76 Impala:
Show-accurate wheels came from Fujimi's Suzuki Jimny kit, and parts box tires provided the correct stance: