Did top end on my 77 1200, can't get gas to front cylinder. S&S Shorty carb rebuilt. New 64 chevy six cyl. Points, good gap and fire.Plugs have good fire.timing good,new cam weights and spring,everything fire is good, good gas to carb. Dry plug on front cylinder, driving me crazy. Not a pro mech. But sufficient. Followed all troubleshooting aspects, still no success. Any other suggestions would be appreciated.