I just purchased a 1978 corvette, L82 4 speed, that had been stored for 8 years. I changed the oil and filters and the engine started and runs great. The clutch had stuck to the fly wheel, probably caused by dampness. I was told to put it in gear, hold in the clutch and rock it until it broke loose. It came loose after about 3 minutes of rocking and all 4 forward gears work fine, but I can't get it to go into reverse. I've driven it around, changed gears but it still won't go in reverse. Anyone have any suggestions???