I have a 71 G4 that´s been sitting for nearly 20 years. Can´t remember why we parked it. Have grandsons who want to ride. Pulled side cover, carb really messed up. Removed 1 from 1969 G3TR, installed it. Have spark, fuel, compression is 60 first kick then 120 second or third,. Won´t start! How do I set timing and point gap? Thanks, Skip