Yeah it can work good.
I did RUFs on my 1980 a while back with the stock steering.
http://board.marlincrawler.com/index.php?topic=74809.0 I had to re-drill center pin holes in the top two leaves for the rears to work in the stock location. You also need to run longer shackles or your shackles will lay out too flat towards the back. It did work well and ride nice.
If you don't care about flex and ride and want to keep it more simple you can take one of the longer thinner leaves from your rear packs and work it into your stock fronts somewhere. That works good to spruce up old front springs. When we did that we got a slightly firmer ride than the rears up front but you get your bump travel back.
The springs settled a bit more after some years and lots of abuse. I am changing to some old man emu springs now.
