Sounds like the input shaft is still spinning even though the clutch is depressed. Could be due to binding in the bush or bearing in the centre of the flywheel, or the friction plate being distorted, which can happen when trying to line up the gearbox to the motor. My experience with British gearboxes from that era is that first and reverse are often “ scrunchy” to select, sometimes it helps to select second then first before starting off.
Cheers,
Woolly.


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