If you've been around the channel for a while, you may be familiar with this story by now. It's a sweet big block powered classic Mopar. It's got lots of gofast parts, and from certain angles it looks like it wants to be a drag racer. And yet the performance is best described as a little underwhelming. So today, let's take a look at Greg's 1966 Plymouth Belvedere II, and see if we can find some of that missing horsepower.