67, 68 & 69 have a very tight transmission tunnel, you need a later model 140, that way you might have some chance of not having to cut the entire floor out from firewall to back seat.

The 2" prop shaft from the later cars does not fit in to the early car at all & it does not quite fit in to the later model properly either, I have had one hit the floor & bend. For those that don't know, the rubber diff bump stops bolted to the floor don't actually do anything. 3 pieces you can delete.