I would wager that stock springs will unseat. I have unseated my front springs (RE 3.5) and I'm still on factory short arms. If you want to go back to the stock springs and spacers, I would think you would need a good limiting strap. A better option I think would be to get shorter coils althought you may still unseat them.
Don't forget you will need to swap out shocks as well.
Don't forget you will need to swap out shocks as well.