Slant doesnt want to start.

Have just put the 2 barrel holley back on the motor after a rebuild,and the engine isnt even trying to fire up.Its getting plenty of fuel,have checked the coil(thats good)done the spark plug earthed to the block test and its got a real weak spark.The coil ohm test is at 1.8 ohms which is in the range i think.I am running a mopar electronic ignition with a chrome colour box with ZFR5N plugs at 40 thou and still using a dual ballast resistor as i cant seem to find a 3 ohm coil here in oz to delete the ballast.Any help you guys could give me would be greatly appreciated.Was starting real easy as usual before this.