Put the anchor point exactly on the bottom of each layer.
Determine the total height of each layer.
Add a simple expression to each layer.
You have an Illustrator file that could be imported as a composition retaining layer size. You also have two text layers. The anchor point is at the bottom of a text layer by default. You can easily move the anchor point to the bottom of your AI layer. As long as the AI layer was imported as a comp retaining layer size so the layer is the same size as the graphic you can add this expression to the bottom layers and have them stack on top of each other.
ref = thisComp.layer(index - 1);
thisLyrHeight = sourceRectAtTime().height * (thisLayer.scale[1] / 100);//Compensate for scale
y = ref.position[1] + thisLyrHeight + 60;// Spacing is 60 pixels
[ref.position[0], y]
This expression will separate any layer from the one above it by 60 pixels as long as the anchor point is at the bottom of the layer.