Is it worth it?

I have just found a truck near me that I'm considering buying. It's an 89 Dodge Ram pickup, body isn't bad. But that's not why I want it. The truck was somebodys project so already swapped in is a 440/727 and 8 3/4 from some 68 car/truck. Is there anything special about the 68 440s? I mainly want it for the resr end considering it has good gears, but would it be worth it to buy the whole thing and sell off the parts?