9and 1/4 versus 10 and 1/2

Hi All,
I'm hoping you experts can help me out. I have a 1965 barracuda with a 273 engine 4bbl (Commando) I ordered a clutch for it about 8 months ago. My kids gave me an awesome present by rebuilding the engine without me knowing. Great kids and friends!! Anyway it turns out the old clutch is a 9 1/4 inch and the clutch I ordered was a 10 1/2 inch. The flywheel has 123 teeth ring and the disc 23 teeth.
I would need to know what I need to do to use the 10 1/2 clutch. Flywheel (external balanced), starter?, throw out bearing? fork? ..... etc. If it is to much of a problem, I may just buy a 9 1/4 inch clutch. Anyway I would sure appreciate your help with this problem. Thanks!!