354 is the second most desirable followed by RRR's 331. They are worth a lot, in the thousands. The stock internals of the 392 are supposed to handle 1000 horsepower. The other Chrysler hemi's close to it. Only engines outlawed by NHRA.
Garlits has said the stone stock 392 crank unmodified would handle 1500 HP. They are NICE pieces.
Also too, don't let anyone tell you the 392 heads are better. They are not. The intake ports are longer on the 392, since the 331, 354 and 392 all used the same intakes. The 392 is the tall deck, which means the heads are farther apart. Rather than cast a different intake, they made the 392 heads with the intake side longer. This also makes an undesirable curve in the intake floor of the 392 heads.
The 331 and 354 oval exhaust port heads are far superior, especially when you upgrade them with the 392 size valves. That's what I did with mine.
Stay away from the 51-53 round exhaust port 331 heads. They are no good for performance.
