Adjust the clutch pedal stop under the dash. And look at how far the clutch fork in the gearbox moves in regards to the clutch pedal.

Look at how it was installed by the dude that did the clutch conversion. Maybe they got it completely wrong in regards to clutch master and clutch slave cylinder sizes. By the sounds of how it's working now, You might need a MUCH smaller clutch master. That would explain why the previous owner has adjusted the clutch pedal stop to look like that.

As an aside..there are only 2 popular sizes for clutch slave cylinders. But several different master cylinder sizes.

Good Luck.