The specific HS part number recommended by TF for these heads("E" at the end of part number)are shorter than the std HS rockers and should fit just fine.
The std HS rockers, along with the Mancini version, are too long.
IMO, this was a mistake made by TF when these things were on the drawing table.
They should have had the shafts located so that the std HS rockers fit properly.
They might fit just fine, but a shorter fulcrum sweeps more, so it will actually sweep slightly more. Still no good.
