Hi, I've been having some electrical problems with my 1971 El Camino SS. It's a 73, 454. Just installed a complete MSD ignition system and coil. It's reading 12.7 volts at the battery when running and 12 volts turned off. Shouldn't it be higher than 12.7 volts when running? The alternator is brand new too. Any suggestions on getting the voltage up? The voltage regulator is the original. thank you!