4 speed shift pattern?

Hello A Body fam, I just recently purchased my 1974 Plymouth Duster, bear in mind this vehicle was born a 318 with a manual transmission, previous owner swapped motor and trans from a 69 Dart so now its a built 340 with 4 speed. my question is this what is the proper shift pattern considering what I was told is correct?. I believe mine is wonky. Reverse is left and back. 1st,2nd,3rd and 4th are all normal locations. where should reverse be? and how is it fixed if it is wrong?
Thank you