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Kimble,

Checked the GM Heritage Center, vehicle kits for '61, '64. and '66, about how many leafs the front and rear springs have, if my review is complete.

Front- all years have 5 leafs.

Rear- '61 K10 has 6 leafs: K20 has 8 leafs; '64 and '66 have 6 leafs for both
K10 and K20, with multiple different spring ratings.

I would say this is close but not absolute, would need to review the vehicle kits in more detail. Their are a lot of different models and options. They due list standard and HD spring ratings for the rear, all 6 leafs,'64 and '66. Also optional rear HD shocks too, did not see any optional front HD shock. Different models had different shocks.

Would say this is general information, with different models and options things may be different.