So the 3 in front of NE57 doesn’t indicate anything? And it is a 392 though? 2000 seems pretty legit price for it as long as there’s no damage to the block or heads I assume?
3NE57 is a 1957 dual quad 392. If it was just "NE57" it would be a 1957 4 barrel 392. The "3" indicates the dual quad.
Main caps are not hard to find or difficult to deal with installing. A lot of the old hemi's can get away with a line hone, not even a full line bore with mismatched caps. Not always, but more often than other engines.