They don't out perform all the others.
There's a bunch of old school hype about them.
The Edelbrock Air Gap outperforms it. And the Edelbrock RPM matches it.
But the LD340 will outperform those 3 other manifolds you have pictured. That's not saying much.
People get off on them because some have factory numbers. But that was just because Chrysler parts dept sold them over the counter. And the old DC Manual said to use them. But of course the Air Gap and RPM didn't exist then.