10 1/2 cast bell

That might a bit tough to find. Technically it's '64 only with a big block (not a 426), though you should be able to make the '65 version work....not sure what the difference is. For a small block, you're on your own as they didn't make one that year (or '65) with the 10 1/2" clutch. Using a later one would require modifying clutch linkage and maybe a different clutch fork and/or pivot.