Clutch for 66 Barracuda Formula S

I'm going with a carbon kevlar disc in my D/Dart. But I have to go with a 10.5 " setup because it has a 360 magnum engine in it. I got the disc from Detroit Clutch Masters.

I was originally planning on putting a straight 10" kevlar disc in it. They are a little pricey and I think they only come in 9.5". I was told a 9.5 disc can be used with a 10" pressure plate.