9 1/4" Axle Swap?

The 9 1/4 is not suitable for racing as it is a C-clip style axle. If an axle breaks, you may go into the wall or send a tire into the spectators. As far as I know, no one makes a C-clip eliminator kit for these axles either, but I've been wrong before, lol!

If you're on a budget and not racing, an 8 1/4 as mentioned by bigblockaholic should be fine for your application.