I am going to convert my Fordomatic to a T85 OD.  I have a 10", or 10 1/2" ? flywheel and want to use a 11 1/2" clutch.  A 11'/12" flywheel is available for me to use as a template, and I have a machinist to drill the holes.  Is redrilling the flywheel a good idea/viable option?  Would the flywheel need to be re balanced?  The engine is all balanced, and not in my car yet.  I'm not sure about the exact clutch dimensions, and I don't want to go out in my garage to look it up in my shop manual tonight.  Should the whole flywheel/clutch assembly be balanced together?

Thanks,

Paul J. - '57 E Code