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Make sure that the wire from the distributor to the coil is connected to the coil terminal with the same sign as the battery ground. Make sure tht the timing is correct. Check the wear on the distributor bushing by closing the points, pushing on the shaft from the side while watching the points. There should be less then 0.002 inches of movement of the shaft and virtually none at the points. Are your points clean and not oily or corroded? Is the firing order correct? Do you have the correct coil? The best way to check for a good spark is to remove the center wire from the distributor, hold it near a good ground, turn on the ignition and try a start. You should see a FAT, BLUISH-WHITE SPARK, and you'll hear an audible snap. If it weak yellowish or reddish then you have a problem in the primary circuit somewhere so check the wiring and make sure all connections are "bright and tight".
IF all these things check out and you get the requiste FAT, BLUISH-WHITE SPARK AT THE RIGHT TIME, then check the fuel delivery by opening the tank valve and removing the plug from the bottom of the carb(If you have one;if not use the fuel supply line to the carb.) and holding a suitable container under it observe the fuel flow. You should have a steady, continuous stream that fills the tube. Intermittent flow or just a dribble means the fuel supply is restricted. If that's good then perhaps the fuel bowl is full of crud or the float is out of adjustment. You coud have a badly adjusedt carb or an air leak around the carb metering section. Concentrate for now and the ignition system beacause 85% of the poor running or refusal to start problems originate there. Get to where you have the requisite FAT, BLUISH-WHITE SPARK and if you continue to have rough running, get back here ans we'll help you go through the fuel system. Hope this helps you.
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