mustang II/grenada parts swap??

[eric simes]

I am the proud owner of a '78 Mustang II with a 302 and an automatic transmission. I have heard that many of the interior parts from the same era Grenada can be interchanged with those of Mustangs. I am in the Navy and am currently stationed 2000 miles from my baby(my Mustang that is), however; I have recently fallen into the ownership of a '77 Grenada which has a 302 and an automatic transmission. My question is: since I have this car in my posession now and my Mustang is so far away can I put some money into the engine and transmission of the Grenada in hopes of later swapping it out with the engine and transmission of my Mustang or would the switch be more trouble than it's worth?