.25 V downstream of the coil with the points closed is a bit too high, but not terrible. Bump the starter over until the points open, and the voltage at all the connections you tested should jump up to battery voltage since no current is flowing. 5V at the coil input id s bit low - - - -if the resistance of the coil primary is correct, you should see 8-9 volts downstream of the resistor or at the coil + terminal. It's possible you might have an "internal resistor" coil in series with your ballast resistor. That would result in a weak spark, but not a "no spark" situation. Try cleaning up the points by scrubbing them with a pencil eraser or a clean business card. Don't file or sand them!
Jerry
