modern muscle

Probably longer than the 2.7 (got one sittin in the yard), which I still find amusing they put that tiny engine in the 300 boat.

Just me, but I wouldn't class either the 3.5 or the better 3.6 as a "muscle car". The 3.6 makes for a fine car, in my opinion, but not a muscle car. The 2.7 isn't even an also ran to me.