By all means. Your junk should be faster too. I installed Warn Premium Hubs on my 60 from a set of drive flanges and the lack of rotating mass in the front shaft really made a difference. I've noticed it on long drives home without a front shaft due to damage. There is a big difference without it spinning. If you want to know how much better you can always drop your front shaft for a week and get some real world experience before dropping the money on lockouts.
If you still have the Dana 30 it is going to get expensive.