There is (probably) original 170cid+"3-on the floor" (converted from steering column), and 7 1/4" rearend. I have a turbo for that engine and 8 3/4 rearend with lock from my ex-plymouth fury '71. It's going to be narroved for Valiant.
About the turbo project; i still have parts to search for (intercooler and electric fuel pump etc.), and this is so called "zerobudget project". Meaning that, the engine will not be opened or anything. This turbo produces 0,7bar compression and wastegate opens at 0,5bar. So it really isn't "HI-PO", but it doesn't need to be. And there's no rush in this project.
And because i don't have my own garage and knowing for turbos, i don't built that engine myself. So don't ask me much about that.:D