What year of car? We may need to know if it is a points ignition or electronic system.
If points, have you adjusted the points gap?
Fuel delivery is the most likely issue. What have you done to the car as far as fuel filter changes, cleaning the fuel tank out, etc.? Did this car sit for a long time at any time in its life?
Also, check the rubber hose coming out of the tank to the hard fuel line and form that line into the fuel pump. A crack in either rubber line will suck air instead of fuel.
It is a 67. I have not adjusted the points. I have recently changed out the fuel filter but have not removed the tank. As far as I know it is the original tank and has never been removed. Also no crack in the hose running to the main fuel line or to the pump. Could it be that the lines are clogged with debris?