May be an earlier ride of his. Apparently he flew just about half the planes in the US arsenal, and most of the P-40 models.
Interesting resource I found after I decided I wanted to skin it:
http://www.p40warhawk.com/Models/Builds/TomSilsbee/P-40L/P-40L.htmComments from his son, but scroll down and you'll see his types flown list. Seems he had a lot of time in P-47s as well.
EDIT: I'm not sure if I should add the tail code, though. AMTech decals don't have it, nor do a couple of other model builds, and some color profiles online. I know, I know, not conclusive evidence, but still an abundance of circumstantial. Since he painted the green himself, I was wondering if he painted over it. If he was painting, would he not have covered the RAF fin flash, no longer needed?
EDIT: Oops, I forgot to answer your question: Yes I'm pretty sure they'll accept Merlin powered P-40s on the -E ingame. Most of them up to the -N were pretty similar. Also our -E has the power curve of a later model (I want to say P-40K, but cannot recall) anyways. They may have tighter rules/more scrutiny once the P-40s are remodeled, but for now it's a frankenstein.