i dont know but i wouldnt think so but if that y block that came in your 56 has allumin valve covers u dont want let me know
I used to have a 56 Premiere. I took the trans out to put into a friends car and was on the fence about getting the trans done or going that route...also had a 77 Lincoln with a runnig drivetrain. I eyeballed it and it didnt seem like a terrible swap but I have no clue if it would be "bolt in". I will say though if the mounts are anything like the SBF early mounts with a stud comin down off the rubber it shouldnt be terrible to do some trmming to get it shoehorned in there.