Sebring 1963 identification

If the image I’ve attached is attached, it shows a 4 engined, double deck, low wing tramsport aircraft at Sebring in the USA during the 1963 Sebring 12 hours race which I have grabbed from the Motor Films Quarterly volume 11 DVD. My apologies if there is a copyright infringement, but hopefuilly a shameless plug for a brilliant motor racing DVD series will get me forgiven. Fantastic motor racing footage, and on this one, a few pics of a Miles Aerovan and dead C82 Packets. If not, I’m sure the powers will remove this posting.

However, I would be grateful if somebody could identify this big shed. Apologies for my ignorance.