Take a plug wire and plug it directly into the coil. Put a spare plug in the the socket and lay the plug on the valve cover. If you don't see the plug spark while it turns over, turn the engine to where the points are open and manually ground the points side. From here you can work up to watching for spark on the spare plug with it plugged in normally into the distributor cab. If your coil is weak, you may get a direct spark but it may not survive passage through the rotor etc. Also the rotor or cap could be causing the problem. Sometimes there will be a crack with some carbon tracking that will short the spark out. Another place to check is the socket where the coil wire plugs into the center of the cap. This often corrodes and will look green in color. That green oxidation is actually an effective insulator.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!