Anyone Deal in ATI Super Dampers or Advice on Were to Buy One

Here's the footnote for the sm blocks....

2. Hubs are dimensioned to clear the stock cast-in timing tab on MOST applications. Due to changes by the manufacturer overtime, the tab MAY need to be ground and re-welded. The damper face for pulley mounting will be forward of the OEM location by .150” for 2-ring internal balance, .450” for 3-ring int. balance, .750” for 3-ring ext. balance. Hubs may be shortened by the listed amount for internal balance & by .600” (.150” fwd of OEM) on ext. balance if tab is cleared. 2-ring int. balance can be installed in OEM location with minor clearancing of timing tab & retain OE timing mark.