For $100 I would want a v6 that needs rebuilding.. because you get a good Upper and Lower intake (See in advantage in that??) and good heads (again.. any advantage??)
Plus, you have a block to build up with a stroker kit. New cam.. all while you peacefully motor around in your running stang until you're ready to do a swap!
For $100 to get everything you need to begin a buildup... I would jump all over that