You can save those gears. Basically you have to grind it shorter on the bottom and add a washer or washers to the top and it will drive the mesh tighter if its the old style gears and not the box. Check out my vid and or the 68 430 thread on mtf here
Start at 4:53 ish I get into the steering
[ame]https://youtu.be/2fuqKcB_GoE?t=4m53s[/ame]
Start at 4:53 ish I get into the steering
[ame]https://youtu.be/2fuqKcB_GoE?t=4m53s[/ame]