I installed a Mcleod RST twin disc clutch, and Mcleod flywheel behind my L76 6.0l VZ about 8 months ago. Clutch pedal is as light or lighter than stock, and really smooth. Works perfect with the factory slave. Compared to my
stock clutch which was slipping really bad at 80000km, so far hasn't missed a beat, even after installing a Tru Trac shortly after.
I bought them new from the US, straight off ebay America, shipping was really cheap only like $60 each, new clutch (6912-07) was $720 US, and I found a brand new Mcleod flywheel (460530) for $150 US, normally $300 + US
and shipping was again only $60. They took over 3 weeks to turn up, I bought the clutch and the flywheel from two different places, and they both turn up on my door step, on the same day.
All the other twin dics clutches I was looking at in Aus where $2000 +, not going happen...
The RST clutch is rated to 800hp, and the RXT is rated to 1000hp, only difference being the different discs, the rest of the clutch is exactly the same.
Here's a good overview of the RST and RXT direct from McLeod.
https://www.youtube.com/watch?v=rWX6zKIGLaI