66 barracuda

Congrats Skullz. To answer your engine question, I'd pass on the 273 unless you're into "matching numbers" and authenticity. I just built my 273, probably cost me twice as much as building up a 318, and pistons were hard to find. A 318 would just bolt in, they're easy to find, parts are less expensive and there's lots of spped stuff out there for it. The 360 is a good choice too, there's nice engine mount swap kits out there that bolt on.