‘73 Duster /6 to 318 Swap

easiest way to go to a floor shifter is to put an aftermarket ratchet shifter in there
keep in mind the 727 needs a shorter driveshaft then the 904

dukeboy_318 said

the 318 will likely break the 7.25 if you get hard on it.

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this i doubt

but since you need to cut the driveshaft anyway for the transmission, it makes sense to swap out the rear end (if you decide to do so) at the same time, and only cut the driveshaft once