Back in 1975, i bought a new Hapco clutch for my '65 Chevelle from my local hero's, at the time the F/MP national record holder...
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Les sold me a 3300lb B&B with an organic disc for my tunnel rammed 301 with a Muncie and 4.88's. Bog city with an aluminum flywheel, but I was still a happy high school kid thinking it needed more gear. Wish I had known then what I know now...
I've got a bin with most everything from organic to full face iron, at the moment my street/strip car has a dual friction. I put some miles on it last fall, the dual friction drives nice and takes more abuse than I thought it would, but i've only sprayed it with one kit on a delay. My 900 series iron puck is down to .310", while the full face iron's narrow hub is almost worn out from all the street miles but the friction is still .340".
Grant