I would first fully charge the battery with a battery charger. Alternators are not meant to charge a dead battery.
71’ STARTIN’ LIKE CRAP :) :) STARTER....
G
WELL BASICALLY EVERYTHING IS NEW. BUT WHEN I THROUGH ON THE NEW STARTER ABOUT 5 WEEKS AGO IT NEEDED SOME SHIMS BUT I NEVER PUT THEM ON SO I GOT THAT LITTLE GRIND SOUND. NOW I TURN MY KEY AND NOT A THING HAPPENS NO SOUND OR ANYTHING TURN A COUPLE MORE TIMES AND HOLD IT DOWN MAYBE 2-3 SECONDS LATER IT FIRES UP FINE. ARE THE TEETH MAYBE NOT HITTING RIGHT DO TO THE NO SHIMS? 
