68 Rear Springs and 72 Rear Springs Whats The Difference? LIFT

[BuildinA68]

I have a 68 K10 I am restoring. My goal is to put a 2-3 inch suspension lift on it to run 33's with out rubbing. It has just a mono type rear spring on it. The Skyjacker lift that I am looking at for my model 68 only offers the rear block. But if I fudge my year up to a 72 it offers rear springs. The 72's are a multi leaf spring.

Before I spend the cash will the rear springs fro the 72 kit work on my 68?

I know that I am not the first to go through this. Just wanted to swap out the 40+ year old springs.

Any Info Would Be Very Appreciated!!!

Thanks