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It would be best to measure it, but should be 10-1/2"

During those years GM only used two sizes in the Vettes. 10-1/2" and 11". The larger being used behind big blocks. Some of the high hp (LT1) types may also have had the 11" unit.

By 1975 that was all gone; however, converting to the larger 11" clutch was and remains a very popular conversion. If your adding power it might be worth considering.
 

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There was a 12 inch GM Clutch made also 7TRoadster.
Usually from a GM Truck.
They also found their way into GM musclecars & Corvettes by previous owners.

The 10.4 or 10-1/2 in a Borg & Beck pressure plate from the 1963 Fuelie 327 Corvette was Heavy Duty & allowed high RPM shifts at ease with no slippage.
Many Musclecar guys used them.
I did too.
 
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