I wish I could say that I had actually done it, but I have not. That said, I think you will find this pretty easy, the forks, if new and 'uncut' will have a long enough steer stem for your headtube. You should be able to use the whole bearing set up, but prying the bottom race off your original fork may, or may not be a snap. The steerstems are a pretty close nominal 1" and you need to have a close fit of the lower race on the stem, the top one, if on the threaded adjuster, will self center and your bearings will carry the load of the set up. Even so, you may want to order the bearingset (cheap, under $10) from whomever you order the fork from.
BTW, Ive been told that Huffys are pretty much interchangable parts bike to bike, not so with Schwinns even, and old bikes have their own issues. For cheap, fun ,messing about with bikes and learning some stuff I think the Huffys are a decent package (I have recently picked up a NIB Cranbrook). The curvy frame would look good with the springer, as you intend, and most likely ride better on the rough over that heavy duty stock fork, which cant flex much, if at all. For just looks, though, a truss rod addition to the stocker would make it more 'traditional'.