Loosen hex set screw at top of shifter and unscrew detent button. Two screws under carpet in front L & R sides. Two more in under console lid in storage area. Should have a light for shift pattern.
I have those thoughts all the time. It's great being able to hop in my Valiant any time I want, and go many trouble free miles. I know I will face issues when installing the 340, but I love sound of cams and horsepower!