As for the clutch situation, we also made a custom chromoly flywheel to suit a 7 & 1/2 inch ceramic triple plate clutch. It is some pretty serious bit of gear. While I am not at liberty to discuss what the gentleman has spent on his gearbox and related parts, you can imagine that it so far has not been standard work. The dog first, input mod and flywheel took alot of time to draw and make so he is up for the development cost as well. Well, not all of it, not even 1/4 of it but being a one off it costs money. But if anyone wanted to install a slave cylinder assy like this to their Datsun it would cost approx $800 for the slave and adaptor. They would have to supply a snout for modification also.