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I owned a clutch shop for 30 years & have heard many people say they have trouble getting a car to go in one gear only. The others work fine. The clutch does not know or care which gear you are trying to put the car in. If it's just one gear giving trouble, it's a transmission, hydraulic, or linkage issue. If it's hard to get in reverse only, it's not the clutch. A poor release will effect all gears. If it's a poor release problem, you can check by trying this.
Put the car in gear (any) with the engine running. Lightly depress the brake and SLOWLY let the clutch out. If the car starts to move or the engine pulls down in RPM when you move the pedal just off the floor, it's a poor release, which would effect all gears. If you can move the pedal up a little before it starts to move, it should be OK. A frozen pilot bearing can also cause poor release, but it usually makes noise with the car in gear and the clutch depressed. The later Vettes have a 'self adjusting' pressure plate which is a poor excuse for a pressure plate. Most clutch shops have a replacement normal pressure plate and clutch that will replace it. You have to drill the cover for the dowel pins and cut a little off the pressure plate bolt flange to make it work. Other than that, it fits great.
Hope this helps a little.