Briz, I trust you have a rulebook... read 7.3.10 about 10 times without reading anything in... or have the wife read it and give her thought....
OK, what it says is if the cases and heads are identical for later years, then they are allowed but it is up to you to prove it to the contest board...
in advance. So if you plan to run 59 cases you need to submit that with documentation proving they are identical for pre-approval. Documentation could be as easy as showing they are the same part number from the parts books.
Or find a set of old cases and head to work with...
Good luck with the project
See ya on the salt