this is the engine..
The manifold your looking for is casting #1827899. It was for 1959 -1962 383s
It was a dealer installed option. When ordered it was shipped from the factory in the trunk to be installed by the dealer.
You'll see an original one here, owned by member @fuely62 post #175
https://www.forbbodiesonly.com/moparforum/threads/62-only.140394/page-9
Nhra had an accepted engine combo for 62 dodge and plymouth, 343 hp 383 with dual quads. Whether or not mopar actually built any is a matter of debate. Dealer install?