I have a 1970 with the 2 year only clutch.

The last time I took the car out the clutch action degraded tremendously.

The pedal felt like it had a detent in it that meant a firm push followed by a significant release.
I put the car on the hoist tonight to see if I could see something obvious in the cable routing or linkage.
All looked normal.

What I did discover is that the pedal action feels fine with the engine off.
Once the engine is running the pedal feel becomes as mentioned above.

Any suggestions what this might be?
I suspect I need to get inside the clutch to figure this out but would sure like to avoid that.

Thanks in advance.

Bob