[DanEC]

I think one of the important features to try to mimic on either the 427 Street or 289 Street is the belly in the rocker panels that bottoms out around the front of the door. I think the ERAs are so good otherwise, that if you can get that area right (as well as the wheel flares on the 427 cars) you will have captured the character of the originals. If anything, it seems to be even slightly more pronounced on the 289 cars - but most of my observation comes from studying pictures.