That sounds more like a transmission issue. If it was the clutch, I think this would be evident on all of the gears, at least slightly. The sound is probably teeth from the gears clinking and it probably have some missing teeth and is slipping. I know that when my transmission went out on my 64 continental, I would hit the gas and it would make the loud noise and rev, but no speed. It's because there is minimal to no contact being made.
Hope this helps, sorry to hear about your car.
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