Yeah I've seen that video a few times.
There must be something wrong with my tunes...... not even my 292/292/108 sounded like that, at similar rpm.
My smallest cam was a Hughes HE2430AL with 223/230/110 @.050; 270/276 advertised, compared to 213/226 on the SMC1326AL Whiplash; and my Hughes had as good as zero lope. My current 276/286/110 has a bit of lope, but I got to retard the timing and lower the rpm to 600 to hear it, and it still don't idle like that. Maybe it just gets lost in my full-length dual 3" pipes and 3-pass Dynomaxers,IDK,lol. Don't care either, in fact the less lope the better, so I can sneak up on guys....
But I gotta admit, that Duster sounds pretty good, and 108 makes a nice streeter..