Sounds like you bent the rear main shaft plate inside the transmission during your botched clutch install. I did the same thing about 5 years ago.... I didn't have the clutch properly aligned and the shaft coming out of the transmission did not fit thru the clutch disc properly - not knowing what I was doing, I just torqued down on the bell housing bolts to bring the engine and transmission together. It ruined the clutch disc and bent that plate in the transmission.
The shifter in my car used to jump forward and back whenever I got on/off the gas and I was in 3rd or 5th. I also couldn't get the car into 4th gear.
The rear main shaft plate is a plate that holds the main shaft in place inside the transmission.
To fix it, I had to drop the transmission and pull off the rear section (center diff) to expose 5th gear and the end of the main shaft. There is a little plate that slides out and is shaped kind of like a 'U'. It was a $45 part from Subaru. I replaced it, tapped the main shaft back into place and put everything back together, and now it works again.
Maybe/hopefully your problem is simpler, but I through I'd throw my 2 cents in....
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