O'Reilly's, Summit, Jegs, Rockauto and many others sell 11" clutch for a 1963 230. They can't tell you what you actually have anymore than I can. Generally they are not listed by transmission. You have to take it apart or otherwise measure. As I said, it can have a 10" or an 11" or maybe a 10.4". Should have an 11" because the 4 speed came with an 11", as I said. Things like that can get changed around by PO's. If you don't need to drive it for a while, just tear it down and then order. Prices are all over the place. From $80 per set to hundreds.
I would think you can put in an 11" regardless of what is has, but can't be sure. Possible your flywheel/bell housing might restrict you.
