360 manifolds?

[furz4]

I have a set of manifolds that were on a 360 that was swapped into a 75 duster and I am trying to identify. I was told they were 75 360 pieces but am having trouble confirming that by part no's. They are 3880905 and 3830684.

 

[furz4]

These seem to have 360/340 sized ports and upper one has 2"outlet and bottom has 2 1/4.

 

[75Sport]

The 3880905 comes up as used on a 1976 Dart with a 318. Can't find the other yet.