I believe that both '85 and '87 are actually 47" long IIRC.
![Yes Nod :yesnod:](https://board.marlincrawler.com/Smileys/marlin/yesnod.gif)
They all come out different depending on how you build them. I usually pick the springs with the most arc in them.
Here is mine with what figures out to about 1" lift with 37's. 5 leaf pack using the thick bottom spring.