i recently found a salvage yard that has both 4th gen ram air and ss' and i can get both a rear end and complete leather interior for around $500 each are these good prices and also are there any problems with swapping these parts into a 89 trans am?

 

the leather interior is a good price aslong as its in great shape......i'm not sure about the rear end

 

any other people with ideas? and thats both front and rear seats