[Excaliber]

It takes time to get that "discerning eye" for many of the subtle differences. Some are are more obvious than others.

Heres something to look for:
Bolt on or "knock off" wheels? How "orginal" do the wheels look? STUDY the original Cobras, use that as a "base line" to compare.

Hood scoops. Some are wider and taller than others. Compare to the 66 427 Cobra model.

Flared or not flared fenders? Original cars came BOTH ways, in fact the original cars had a wide variety of differences.

Perhaps the place to start is to understand the differences in the "real" Cobras THEN you will have a "base line" to compare the replicas.

New "alloy" Shelbys and Kirkhams are very very accurate in detail.

Ernie