I ditched the original axle for a 4" dropped tube front axle with a disc brake set up. I bought it slightly used from a friend who had it on a '32 sedan. I took the original front springs, which were well worn, to the spring shop and had them make me a new pair. I just had them change the arc so the front end would sit a little lower. I got rid of the original shackles and bushings and used rubber bushings and new shackles. I got most of that stuff from Eaton Spring. I did the Vega cross steer because it came as a package deal with the axle. I'm glad I went with the Vega box because it really wasn't difficult and I think it may be a little safer. After I put everything together, the front end still wasn't low enough, so I took the front springs back out, had them shortened a couple inches and reversed the eyes. Perfect!! My rear is out of a '57 Chevy. The only thing that had to be done there is to move the spring perches in a little. For the rear springs I did the same thing as the front. Shocks in the rear are '55/57 Chevy, front are chrome P&J. You can go to the HAMB and see my build, there are a bunch of pictures that might help. Also, if you need specific part numbers I can get you them too.
I will say that the guys on this forum and the HAMB are the best and there is no way I could have done it without them. Ghost, TFoch, Carl5coupe and a bunch of others; full of info and always willing to help. Hope this helps.....