Not sure where you're looking but ACT rates all of their clutches by torque and always have for 15 years.
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The terms 2100 etc. are used by DSM'ers, not internally by anyone that works at ACT.
Having said that, the two things you want to look at is the torque capacity and the friction material which will determine your drivability.
Either a MB1-XTSS rated at 400 ft. lbs of torque ( 2600 with a street disc) or a MB1-XTG6 rated at 513 ft. lbs. ( a 2600 with a sprung 6 puck) would work for you. I would only use the 6 puck if you plan on launching the car a lot and slipping the clutch. The street disc won't put up with that for too long.
Daryl