1970 duster slant 6 5 speed swap

I would check out SlantSix.org. Several slant to 5 speed swaps there, most being a T5 trans.

Slant Six Forum, :: View topic - T-5 Behind a Slant

Slant Six Forum, :: View topic - 350Z CD009 Six Speed Swap

If you search on there for R154, you might even find the pictures of the adapter plate I had made to mate an R154 to a slant bellhousing. Another one of those projects that didn't get far enough.