Manifold ID in early A-Body

Hey all,
A few years back I got some exhaust work done on my 65 valiant w/ 318 and the shop said I have some rare manifolds allowing this engine to fit in the car

Driver side manifold is part # 3614395 which comes up as a 71-73 dart 318 and the passenger side has an 11 . 9 . ($) 8 which is kind of illegible hence the money sign

Any idea what they were talking about?

Someday I may upgrade but I wanted to figure out what they were talking about...possible the driver side since it clears my manual steering box nice and clean?

Thanks in advance