I just changed the alternator and battery on my 1966 Chrysler New Yorker and now it won't run?

I JUST REPLACED THE BATTERY AND THE ALTERNATOR BUT IT WON’T RUN. THE BATTERY DIED ON ME AND IT SEEMED AS THOUGH IT NEEDED TO BE REPLACED BASED ON HOW OLD IT WAS SO I STARTED THERE. AFTER A FEW DAYS IT STARTED TO REPEAT HAVING A HARD TIME STARTING NEEDING A JUMP TO START SO I MADE THE NEXT MOVE TO REPLACE THE ALTERNATOR. WITH THE ALTERNATOR REPLACED AND ALL CONNECTIONS TO THE ALTERNATOR CLEANED, CONNECTIONS RESTORED IN CORRECT LOCATIONS AND CORRECT BELT TENSION I CANNOT GET IT TO STAY RUNNING. THE ENGINE TURNS OVER AND SOUNDS LIKE IT WANTS TO RUN BUT DIES WITHIN ABOUT 2 SECONDS. I CHARGED THE BATTERY AND TESTED THE VOLTAGE MAKING SURE IT GOT A FULL CHARGE BUT IT STILL WON’T GO. I HAVE NOTICED THAT THE CLAMPS FOR THE BATTERY POSTS ARE A LITTLE COROADED SO THOSE ARE GETTING REPLACED ASAP AS WELL AS REPLACING THE VOLTAGE REGULATOR. ALSO, IT WONT START OFF OF A JUMP START... ANY OTHER SUGGESTIONS?