Yes, on the front face of the block, on a boss visible behind the lower radiator hose just behind the timing cover. It may be easier to read it from below. It's a machined flat pad, not hard to find once you look down there.
If you have PHS, there is also an engine unit number (normally on PHS, not always on billing history) that matches the number above the YJ as well.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching
