Help Identifying a 392 HEMI for sale

Looking at a 392 HEMI ad for sale on local FB. Sent a couple of questions over about it but haven't heard back from the seller yet.

2 numbers show on the block:
1873729 (Think this is a block number, hard to tell from the photo)
3NE571606

1 number on the heads:
1731528-1

It's all in pieces, includes the block, crank, heads and 2 4 bbl carter carbs with the linkages. No pistons, rings, or caps. Selling for 2000. I think this is a crazy price if it's a legit 392. When looking at a couple of sites to ID them, I saw 3NE55 and 3NE56, and NE57, not 3NE57 so I'm not sure.