833+magnum?
Are you going to run the fuel injection or switch it to carb ? Mine is 99 360 magnum/4spd with carb in 68 valiant. If you are close to topeka you are welcome to come look at mine.
http://www.forabodiesonly.com/mopar/showthread.php?t=286998
This will answer alot of your ? I have a cast iron OVD 4 speed that I would sell or trade cheap