1971 Dodge Demon "Pazuzu" Build

Sounds like a great project!
Reverse should be left and up.
I think the flat lever on the transmission is upside down.
Flip it over and that should fix it..........
You'll probably have to readjust the rod to get it to work properly.
The first thing you should buy is a Factory service manual for the car, stay away from the cheap Haynes or Clymer ones.