Have owned a dozen & a half 11" cast iron flywheels. Original 11" Pontiac flywheels had the drilled & tapped holes further outward than on the 10.5" flywheels, yes they weigh more than the common '65-75 10.5" version. Have also had dual bolt pattern cast iron flywheels that accept both sizes of clutches. No date code cast into them, so I assume some 70's-80's aftermarket offering. In the mix, numerous '77-79 w72 11" flywheels, these only had the 11" pattern drilled & tapped.
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