Best 3/5 drop with spindles

[c10noob]

I'm new to the website but it looks great. I recently bought a 1970 shortbed with chevy front clip, I'm not the most mechanically inclined but I thought this would be a fun project to take on with my kids. As of now it sits stock but after doing a bit of research I've decided I'd like to go with a 3/5 drop. I like that stance the most and I'm not ready to notch the frame. After reading through a bunch of posts it seems that alot of people are happy with ECE sets.

My question is how can I get a 3/5 drop without cutting springs, I can only find 2.5" drop spindles and 1" shocks which would get me 3.5"

Thanks in advance for the help