NS 23 doesn't add up to anything for me.

The engine prefix does seem to be a '50 216, but from a sedan delivery, not a medium duty truck.

When you have more information post it and I'll see if I can do anything with it.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...