Saw this on craigslist and was curious how one would identify this engine?

By color it looks like a 261, but I thought they're supposed to have 2 short captain's bars towards the rear. This looks bigger than a 216, which was the original. In a '41 Chevy pickup.

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Attached Images
inline-6-1.jpg inline-6-2.jpg

TT
Keroppi - 1946 Chevy 1/2 Ton Pickup