Exhaust manifold casting numbers

Is there anything you guys can decode from these casting numbers? I have 2 sets of exhaust manifolds that I have no idea what they came off of, and I'm not sure which manifold is with which set.. Either way I'll type out what I think the numbers are on the manifolds, if there is nothing you can do with the numbers no worries.

3870337
1.16.76

3830684

3370337-3

4041486

If it would be easier with pictures just say so and I'll take some.
This isn't a serious matter, I just have them lying around and am curious what they're from.