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.
Do you have:
- Voltmeter
- fuel pressure gauge
- access to compressed air
- a place to drop the fuel tank
