shifter won,t line up

hi guys,
we pulled a 318 and 904 out of a 72 challenger and replaced it with a 340 and 727,pretty sure the 727 came out of a abody the problem is now the shifter wont line up,you can get 1st and not get park,you can get park but no first,it is a slapstick,is there any difference with the selecter on the box,what do u think is the problem?:sign3: