833 B to 833OD

66fs
So hang a GV on the back, and run 3.91s.Shazzam. And if you find a 3.09/direct4th gearset. Double Shazzam!!
And if you leave the GV computer in the box and hardwire that beast, through a reverse interlock relay, that GV shifts like lightning. You will not find the tell-tales in the blackies. It will bark the tires at 70plus. Ok, my S barks em at 70plus.

Plans are to run 3.91 Track lock Sure Grip in a 72 case. Iron case OD is fine with me for a street car. I'm already too fast, 140 mph+, for the environment here in SC and that is with a +.030 273. I doubt a GV OD is in the cards for the 66. Besides, simple and cheap is good with me. That's why I've driven Mopar all my life, no special parts required. Want to go faster? Bump up the cam and valve springs, get a good valve job, and start tuning. The rest is strong enough. How long does your 340 clutch disc last? You are running a stroker engine, right?