Mid,
I have replaced (2) clutches in SPFs.
Your description, along with the age of your car (1670), sounds more like you pushed metal on the flywheel surface. I have 6,000 miles, and I have never adjusted the clutch.
Normally, an aluminum flywheel is installed on SPFs. Not ALL of the flywheel is aluminum, but the surface for the clutch is.
Adjusting does not seem to be the answer to me, but I hope I am wrong.
CenterForce makes a nice unit if you have to replace yours.
Eric
