[CSX 4027]

Right.
Ford made at least 2 possibly a few more.
The reason for them in the first place was when Miles stuffed the Iron block Iron head motor into the 289 #2196 and stuffed it into a tree.
Miles said he needed light weight to make the leaf spring car turn so Shel asked Ford for aluminum. Since the sideoiler was just the new latest and greatest, they cast aluminum and sleeved it. Hence 390 size which had lots of RPO items on the shelf.
2196 got one of the alloy motors with the 58 webers and 3002 got the single 4 version.
I am aware of the original flip top motor being alive and well after its failure and repair to a non thrust side. Sadly it's not in the flip top which sports a new Shelby Aluminum Block.
The 3002 motor is presumed long gone