overheated the other day so i turned off the engine

my 1976 stepside gmc seirra grande 15 overheated the other day so i turned off the engine and coolant started spraying everywhere and my rad cap was gone. so after i had filled my rad back up and got a new cap i try and start it and now it wont even turn over, i dont even get a click. i have all my power and my headlights do not dim when i attempt to start. i took my starter and solenoid out and had them testes and they were bad so i bought new starter and solenoid and put it in today. still not even getting one click or crank. so i just change my ignition switch and still nothing! Any ideas? btw its a 4 barreled 350 ci engine 1/2 ton 4wdg

Check/Test the park and neutral safety switch-if okay check engine if its seized

i will check my park/neutral safety switch. i have been able to turn my engine over by hand that is why i think its not seized

Make sure that you have wired the new solinoid up correctly, it may be a s simple as that.