yes, in fact the higher up the HP rating you went, the more a manual tranny was recommended....

PONTIAC CAME STANDARD WITH A 306 HP MANUAL TRANS IN THEGRAND PRIX THE 330 HP ENGINES WERE OPTIONS IN FULL SIZE MODELS AND 348 HP OPTIONS IN THE GTO SOURCE ENCYCLOPEDIA OF AMERICAM CARS 1940-1970 BY RICHARD M.LANGWORTH AND EDITORS OFCONSUMERS GUIDE