I think only 440-6 and Hemis had the scalloped clutches but I use them on everthing because of the extra 1/2" of friction material on the outside diameter. I still have the assist rollers in my pressure plate. The faster it spins, the tighter it gets.
Make sure that you get the special 6 bolts for the scalloped pressure plates. They are 3/8 but have a smaller 12 point head to get into the tight space. You don't have to use them but it sure makes tightening them a lot easier that a 9/16 headed bolt.
When you bolt the pressure plate and disk to the flywheel, check your finger height before you install the bellhousing. Some vendors say "no adjustment needed" but I've seen too many out of adjustment and just had to adjust a friends last Wed. You can see them out of adjustment 1. if the fingers pull too far in when you tighten up the bolts, or 2. if the fingers are still up against the pressure plate when tightened down.
