Im no expert on suspensions and I too, have some questions on indepedent front suspensions. I can share with you what I have found out so far.
Progressive Automotive, in Ohio makes a Mustang 2 and a Corvette set up for your chevy. ( A Corvette front and rear under your chevy would be great! Might be a little pricy for the Vette parts but as my kids say it would be " Way Kool "
If you go to WWW.google.com
and search for suspensions for a 57 chevy you'll get a whole bunch of places to check.
Hope this helps.