I need help! I am building a late Merc Flathead. I had the engine and flywheel balanced. I tried to put the flywheel on and it binds on the block . I have another flywheel that I can see is different on the backside and it will fit. It is drilled for an 11 inch clutch. My question . Can this flywheel be redrilled for a smaller clutch? Will switching flywheels mess up my balance job and what could I do about it? What kind of flywheel did I spend my money on that I cant use? It is drilled for a 10 inch clutch.