I'm having similar issues with my '78. It ran fine when parked last year but won't start now, not getting fuel to the carb. I have fuel to the pump as when I pulled the line at my filter, gas poured out. I have a trollhole carb so no return. If I have fuel to the pump, the pump should be good, correct? I'll have to pull the line at the carb to see if its a carb issue or a line issue, but I only run non ethanol premium, so it that shouldn't be an issue. It runs fine off of starting fluid.