No expertise here but the original '64 GTO used a Belleville style diaphragm type pressure plate. It was something I remember was always mentioned as a technical "feature", something to oooh and ahhh over, like the fact it had a Hurst shifter.
Pretty sure same type was used for all Tempest applications, different dia. and/or spring pressure used. I remember the original pressure plate was very "stiff" in my GTO even with 18 yo legs. While I was away at college, my sister had the clutch replaced and I was very bummed when I came home to discover how feather-light it felt. Never thought that clutch was as good as the original because it took so much less pedal pressure to release.
The Belleville style is what your new one is.
The 3 finger style is called a Borg & Beck style. It is similar to a Long style which is for drag race applications because of adjustability from what I read, you wouldn't use a Long style on the street. A Borg & Beck can be (not always) designed to increase clamping action under high rpm to reduce slippage.
Each has its merits I guess.
But the original behind your 326 would have been the Belleville style AFAIK, in '64 or '65.
I'm not familiar with LuK as a brand, but then I wouldn't know one brand from the next, haven't bought a new clutch in decades.
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