Galloping Ghost also reminds of the "A" model, or Apache, first delivered to Great Britain, and with the Packard engine. This makes it one of the first Mustangs built.
Evidence is the lack of a bubble canopy, which the original Mustangs did not have. The aerodynamics of the original lack the burble of the blister, and are slipperier; The new Grifon and Merlin more than made up for the sexy new bubble's drag.
I think in 1947, the Ghost retained all her original wingspan?