1/2 vs. 3/4 ton leaf spring differences

[BigRed76]

I'm in the process of converting a K10 chassis to K20 for my '70. I've done some searching and haven't found much info specific to 67-72 4wd springs. Basically I'd like to know the difference of leafs between 1/2 ton and 3/4 ton springs on 4wds.

I will be lifting the truck 2" with Tuff Country EZ-Ride springs in the front, and was thinking about going with 2" blocks in the rear, but I don't want to use 1/2 springs in the rear. Tuff country lists the same part #'s for springs for 1/2 ton and 3/4 ton, not sure what's up with that

My current 1/2 ton springs have 2 leafs up front, and 4 leafs plus an overload leaf out back. And I have a set of rear leafs from a 2wd 3/4 ton, which have 5 leafs plus an overload leaf, but they are only 2.25" wide.