Before you grab any derelict Mauser for a conversion...
Pre '98 Mausers, like the 91 through 96 Mausers (known as Small Ring Mausers), weren't built to handle the pressures of cartridges like the 8x57, and later .30-06 and .308 Winchester.
The '98 Mausers, also known as Large Ring Mausers, came in a variety of action lengths. A popular surplus '98 Mauser available at good prices these days is the Yugoslavian M48 Mauser. It's an intermediate length action, shorter than a Gewehr98 or Czech VZ-24, so running the longer cartridges like the .30-06, .280, .270, 6.5-06, .25-06, and 6mm-06 may require some modification of the action.
Some aftermarket parts for '98 Mausers won't fit the Yugo M48's, or the popular Turkish Mausers, so be careful with your research before you commit to building a custom. That being said, your VZ-24 action should be just fine for stuff like the .270 Winchester. The .338 Lapua will require extra work to the VZ-24's boltface, extractor, and maybe the magazine rails.