Hey Mike, I have seen the 9-1/2" clutch packages on the Brewer's website. These range from 400, 500, 600, & 750HP with all new billet 122 tooth flywheels and clutches that fit within the original 273 & slant 6 bell-housing.
Didn't really want to Hot Rod my Barracuda, but I do have a fresh 416 with TF heads on a stand, it's tempting.