I wouldn't jump to it being a bad clutch so easy...has anyone looked at it for you to verify all else related to the operation of the clutch is well? Have you put the car in 5th gear while going 20-30 MPH and given it full throttle to see if the clutch slips or if it grabs and boggs down the engine?
(not sure 100% on best speed/gear for that clutch test, maybe someone else will give better known numbers)
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