Technical Overdrive options for gasser

I have a Mopar 833 OD in my 68 Barracuda coupe with strong 340 and 3.55 gears. ****** has terrible ratios for any kinda of racing or even just gettin' on it alot. Next chance I get it will be replaced with the std 833. OD is great for pulling my TrailorBoat camper around and getting good fuel mileage but that's about it. I have had several of the OD's and liked none of them I'm sorry to say. It is much lighter with the aluminum case though.