318 dart to duster Engine Swap

so since your moving trannies, do they both have the same rear end?
the darts wheel base is 111, the duster is 108 so the driveshaft will need to be shortened atleast 3 inches, perhaps more depending in rear ends

i would say if the radiator fits in the dart, it should swim in the duster


motormount, as dukeboy mentioned, you need spool mounts (edited for accuracy)
what K member is in the duster, still the slantie unit?
if so, you need conversion mounts

'73 & UP A,B,F,M, J-Body Products

i dont know if you would be able to swap K member alltogether between the two cars