For the rears up front you may need to buy or fab a drop hanger for the front. Some rears have more arch to them than others, yours look to have more life in them. For mine I used some degree shims and a drop hanger to get a good pinion angle but still keep the improved approach. If you want to take advantage of moving the axle forward then the long end of the spring goes to the back.
![My Two Cents :twocents:](https://board.marlincrawler.com/Smileys/marlin/twocents.gif)