Has anyone ever tried the Muncie overdrive gears?
 

I saw this Ebay auction Muncie Overdrive Gears and it sounded like a nice alternative to getting a TKO 5 or 6 speed. Has anyone tried these gears or know someone who has? Are they as strong as original and will they hold up? Seems like a good idea if your musclecar is a cruiser vs a racer.