Just so you know the rear Marlin, All Pro & TG springs don't bolt to the factory locations. You will have to cut & weld. The ride is better due to the longer spring. All the springs that are a direct bolt in will ride way too stiff & won't flex
http://www.marlincrawler.com/suspension/leaf-spring/leaf-spring-kit-rearif the back ends up too low put that lower block back in and you can get some height out of that.
Install longer rear shackles. Stay away from blocks if you can.