Extreme clutch shudder

Installed a new factory mopar clutch from Brewers Performance, I have extreme shudder upon take off to a point that the rear wheels hop violently, removed inspection cover and noticed that the pressure plate was hitting the starter boss, I contacted Brewers and they said they have run into this once in awhile, the boss on some early bellhousings are larger they told me to either relieve the boss or the pressure plate, my question is would the plate hitting the boss cause the shudder?,