YES THE 390 WILL BOLT UP TO EITHER C6 OR CRUISE-A-MATIC FOR I KNOW FROM DOING THIS SWAP MYSELF IT WILL FIT FINE, ONE THING I WOULD HIGHLY RECOMMEND IS A STALL CONVERTER FOR THESE GALAXIE AREN'T EXACTLY LIGHT, AND A STALL WILL HELP OUT ALOT IF PERFORMANCE IS WHAT YOUR AFTER HEADERS WONT HURT EITHER WHICH BRINGS ME TO MY QUESTION DOES ANY ONE OUT THERE HAVE HEADERS FOR A 64 GALAXIE 390 MOTOR AND C6 TRANNY.