Again, I thank everyone for your input. Bottom line, the reason I want an overdrive is so I can drive the car more. If you've read my previous post about this car, it's bad a$$ and a ball to drive. I thought with the monster cam in it, I'd be better off getting the rpm down. I'm really afraid of breaking valve springs. Again, it's bad a$$. I think I'll just drive it and have fun. If it breaks, I'll drive the truck. After all, I put the Muncie in it in 1979. I can't believe the Gear Vendors overdrive are as pricey as they are. I could build an engine for the amount they want for them.