Look, you gotta get the seat duration first. It's gotta be GM big, like 320-300*'s. Once you get that, you blow the LSA way out, like 116-118. Now your starting to cook. Once you settle that, you gotta split the damn overlap. So install that ***** about 122-124 ICL so that pig closes real late on the intake and you open the exhaust real early.
That's what you gotta do to get what you want. Hell, been doing it for years. And not only will you get "that" sound, you will get 54 MPG and run 11 flat on pizza cutters. It will also idle at 57 RPM, rev to just past 8k and impress all the seat covers you can find.
Now you are good to go.