1966 Mustang Technical Help

[Cool_Man_128]

For some time now I have been looking for an old 1967 or 68' Fastback to either buy or restore because I just love their classic look. I have recently found a 66' fastback without an engine or transmission but the body is in pretty good condition. I was have a few different questions I would like to ask. First, what are the differences between the bodies of the 67+68 as compared to the 66'? Next, I hear that cheap classic mustangs needing to be restored are hard to come by and a rare comodity. Should I get this 66' because my chances of finding a 67' or 68' are bad? If I fix up the 66' what kind of engine should I put in? (If it is hard or to expensive to go original, then I just want power. Is it hard and/or expensive to go with the original trans and engine, or should I go with a newer more powerful engine? Finally, this is probably just a matter of opinion, but... is the 66' fastback a prized mustang like the 67 or 68? As I said I was hoping for a 67 or 68, but from the pictures I have seen of the 66, I think I could just as easily settle for it. Any information would be helpful. Thanks.
Jim