The fan in my photos is the 480033 Power-Flex, used on many non A/C applications.

Usage on '69 models (Firebird) is as follows:
4 blade 17 1/2" diameter: 6 cyl w/o A/C
4 blade 19" diameter, 2.3" pitch: 350 w/o A/C, Firebird 400 Ram Air
5 blade Power Flex 19" diameter: Firebird 400 exc. Ram Air, all 350 with Heavy Duty Power Flex Fan option
7 blade Power Flex 18" diameter: Firebird 6 cyl with A/C or Heavy Duty Power Flex Fan option
7 blade Power Flex 19 1/2" diamater: Firebird V-8 MT with A/C, Firebird 400 (exc. Ram Air) with Heavy Duty Power Flex Fan option, Firebird 400 AT except Ram Air with A/C and Heavy Duty Power Flex Fan option, all 350 with A/C and heavy duty Power Flex Fan option
7 blade Thermo Clutch 19 1/2" diameter: optional on all V-8 engines with or without A/C except Firebird V-8 (MT) and 350 H.O. when equipped with A/C