Hey guys, does anyone know the right part # for a dual friction clutch kit for my car? I keep coming up with a couple different numbers.

I have a 72 Duster that I'm droping in a 1974 360 with an A833 cast iron tranny, it has a 10.5" clutch now, but when I look up clutch kits for my car I get a 10.4 and an 11", both saying they fit a 360. Looking to buy asap so I want to make sure I get the right one, and I know there quite popular around here. Thanks

Butch