differnce between a 77 motorhome 440?

You can use the engine , the block is the same as every other 440 , mount ears are in the same place , what you can't use without major cobbling in the trans . As mentioned no slip yoke and it will have a brake drum mounted on the rear that was the emergency brake for the motorhome. You can remove it but I think the trans mount is in a different location and you will have to make up a hokey driveshaft , it will be cheaper to buy a car specific 727.