Why not run the stock GM throwout bearing? I can't speak from personal experience on aftermarket but I was researching master issues online a while back including Ls1tech and other sites and came across lots of recommendations for the stock GM throwout which is what I'm running with a tilton master.
I've only had the setup together for a relatively short while but it has survived 10k miles of which 1k miles is on the track (road course) as well as another unknown amount of miles on 20-30 autocross events.
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