I drilled a 1/2 inch hole in the bottom of the last single piece scatter shield I had aligned with the tranny side of the flywheel That worked well for using the feeler gauge
I ended deciding to adjust the free travel on the clutch pedal so it had about 1/4 to 3/8 inch free play all the way up with it all the way out and that allowed me to speed shift the slick and pro shifted drag racing tranny( a long time ago) very nicely from then on