Paul,
As you know mine is an imperial chassis (so rover) and I used the clutch pedal as supplied. I have the long bellhousing and the clutch seems to work fine. I drilled out the the blanking plate which left holes so that I could mount the master cylinder. I would be interested to know what size spacer you bought.
Are you using an AP clutch (slightly heavier duty)?
After looking at the treads here I went for the SAAB Release bearing.
Cheers
Steve