My interchange book shows the 69 396 fan clutch drive. 7 blades, 18 inch diameter, part number 393996.
Shows it used on :
69 302
69 427ci 425 hp
69 chevelle v8 with ac
69 & 70 nova 350 with ac
69 & 70 396 ci 375 hp
70 350 ci z28
70 454ci 450 hp
70 all v8 with ac