Aftermarket Flywheels

I need to get a flywheel for my 383. I was looking at Summit and all of the flywheels listed say to not be used with a stock style clutch, that when using a performance flywheel a performance clutch must also be used or there could be insufficient clearance between the flywheel bolts and the hub of the clutch. Is this true anyone experience this? I have a used clutch that doesn't have to many miles on it and would like to reuse it.