I have a similar set up in a '78 TA. I recently changed from a Spec 3+ (carbon semi metallic) to a Spec 1 (organic). I autocross about once a month, otherwise I don't beat on it too hard. The Spec +3 turned out to be overkill for me, and it was pretty hard on the flywheel. I have one autocross event on the organic, and it didn't slip. It's also a little easier to operate in normal driving. Both are pretty easy on the leg with no hydraulics. I had a Hayes organic on the previous, milder 455. It was fine for my driving style as well.
Some on the forum like LUK, which seems to be a OEM replacement and reasonably priced.
Hope this helps some.
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