3751084 manifold casting number

3751084 casting number is a rear dump driver side exhaust manifold.
I'm guessing it's not an A body manifold, but it looks like it may work on a 74 Duster with a 360. power brakes and steering.
I can't find an A body 340 or 360 driver side manifold and there is a casting number 3751084 on ebay. Any thoughts?