I know how Charlie Brown felt when his Christmas tree fell over now... So I blew the motor in my 77 aspen. What are some pros and cons to an engine swap? If I went with another period slant six would it be as simple as plug n play? Where does one even acquire such an item in good enough condition? If the money is to be spent, would it be better spent in something more modern or upgraded? I've never tackled a job this big before and I figured I'd ask the experts!