A833 18 spline 4 speed crash box.

19DART66 said
I am not a fan of hydraulic clutches, especially with a soft lock clutch, mechanical linkage has more feel and can be adjusted easier for the air gap between the clutch disc and pressure plate, and the most important thing of all reaction time at the line.
P.S. I use an old Hurst Ram Rod shifter with a couple of mods.

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I've never driven a hydraulic clutch before. The 4 speeds I've had have all been mechanical linkage. I'll probably stick with linkage then. My 71 Demon has a Indy headed 440 with 2 inch TTI's.. I was reading on TTI's website and found I'd need a modified Z bar. They offer a modified Z bar that'll work with their headers.