No spark

Hi everyone I have a 74 Dart sport 360 4 speed,I was out for a ride got on it real hard blew both belts off the pulleys and then I lost all power when I would turn the ignition there was nothing thank's to you guy's I found the ground wire on the battery post was cracked replaced it with a cheap 1 from o'Reilly's it now turns over good but now the fuel pump does not come on and there is no spark, I have checked all fuses they are all good it has a msd ready to run distributor with a blaster coil and the ballast resistor is bypassed how could all of this happened on 1 ride when it was running excellent what could this possibly be thank you Tom.