Well I might be wrong in this case. Maybe the clutch isn't doing much for you yet? Good performance increase either way. Too bad changing the clutch isn't as simple as changing plugs.

I will be going with a Soft Lok or counter weighted long style pressure plate from Ram with the new engine. Sintered iron disc of course. Wish they were cheaper!

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65 mustang fstbk, mild 289, T5, 4.11s. 12.76 at 105 mph altitude corrected. In progress of warming up the 289.