Looks to me like the later 64 cars all used 2 belts; One driving the W/P and the Alternator, one driving the W/P and the Power Steering.
The A/C Crank pulley was separate and located behind or in front of the 2 belt crank pulley. The A/C Belt does its own deal, the P/S does its own deal, and the P/S does its own deal (EVEN WITH A/C. The difference in the two systems is that the early system had the dual belts going around a Dual Alternator Pulley and a Dual Power Steering Pulley I believe.
The later cars had single shieve Alternator Pulleys and single shieve P/S Pulleys.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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