That sound made me think of early high school days. My best friend and I were double dating in his 56 buick. Drove into the Krystal parking lot he pulled hiss choke all the way out making it sound like it had a high lift cam. Got a lot of looks till his girlfriend shouted out with all the windows down, "Push the doggone choke in this thing sounds terrible." He slowly drove out of the Krystal as he slide down in his seat.