So 67 to 72 will all be the same?? thanks for the heads up!
and to trouble the waters even more, some A/C cars run a 2 groove water pump pulley that runs two belts over the A/C, alternator and waterpump
some A/C cars run two belts on the A/C and alternator and a third belt on the water pump and the power steering pump
some non A/C cars run a belt on the alternator and water pump and a second belt to the power steering pump
some non A/C cars run a single belt on the alternator and the water pump
and just for fun, here is a picture I borrowed from the ramcharger forum with a 360 with a 3 groove water pump pulley...no A/C
http://ramchargercentral.com/index.php?action=dlattach;topic=148198.0;attach=191602;image