We ran several of these in the old days. They came on the RO/WO cars. Dick Landy also did those mods.

The only other option for the Street Hemi SS cars at the time was the Rat Roaster, which was a little better, but not much. We found the Vanke/Landy intake was about a half a tenth off from the RR. The Vanke intake took a lot away from the bottom end, but it picked up quite a bit on the big end.

As I recall, the jetting was not all that different from the stocker. A bit, but certainly not drastic.