cant get it started!

alright so i cannot get my slant six to start its 1973 225 outa a 73 dart sport..i have replaced the ignition module,ballist resistor,igniton coil,voltage regulator,battery, stilll seem to get no spark,im stumped..all grounds seem good,and the motor is turning over just not getting spark,have been testng right off the coil wire to the distrubutor.need help/tips asap its too nice to have my car inside