Here is a photo of a 66 but should be the same as a 70.

It is hard to see as the part isn't cleaned up,
I just grabbed it quick fer this post.

Note the arrows. The one on the left is the hole you will need for the pivot post that attaches the shifter to the tranny, this will need a rubber boot. I think you will also need a bracket on the frame for the Z bar. The one on the right is really hard to tell, but there is a heavy plate under the bracket. It does not weld directly to the floor, see outline. If you need more pic.s I have one still in the car but will need to take out the counsel for pictures. Hope this helps.