It may be a weaker clutch to start with, but it sure holds a lot stronger once a South Bend Clutch is in there. No need to upgrade to a 13" flywheel either(it comes with 13"), like us clowns with 5 speeds have to, if we want the full benefit of the extra surface area.
BTW, the HO engines have plasma-coated pistons, in addition to the other upgrades mentioned.....