You should be able to buy a new copy of InterNiche's stack that works on the current versions of CW.
Small and Portable TCP/IP Protocol Stack Source Code for Embedded Devices: InterNiche Technologies
If the budget won't stretch to that, but will pay you to spend a lot of time modifying code, then read TN268, which details how to convert pre-7.1 projects to 7.2 and after. They changed the ABI (which registers pass parameters and so forth). This really only affects code with assembly source code files.
http://cache.freescale.com/files/soft_dev_tools/doc/app_note/TN268.pdf
Also type "TN268" into the Search Box and read up about what others have done when handed this problem.
> CodeWarrior Special Edition Classic
You know that's code-size limited to 128k? Will your project fit? You could even use MCF52230/1/2 (128k) parts with that limitation.
Tom