I have a 74 GT380 that I bought new that has 1400 Miles on it. I haven't driven it for 40 years. Now, trying to get it running there is no spark. Because of the spark problem, I changed the points and condensers (the old ones looked like new). I put in a new battery and it gauges at 12.8 volts. The new points gauge at 10.7 volts and I now have spark at one cylinder. Any help on why the voltage at the points is reduced? Also any suggestions on what could be limiting spark to only one cylinder?