rear gearing with a four speed A833.

The Dart Lites and Featehr Duster /6's came that with the 4speed OD had a 2.94 or 2.76 rear gear fromt he factory. I drove one for about a quarter million miles and it was not problem to get moving at all, living in the mountains here and the 360 will be even less of a problem if a stock or torque cammed engine.

The newer Challeger 6 speed manuals have 5th and 6th gears as OD. 5th is a .83 ratio like the A833 OD, and 6th is an 0.5 OD; it wil run at 1750 RPM on the interstate at 70 MPH with NO problems and even will drive up 95% of the mountain interstate grades here in VA/WV with no lugging.

So, based on this, the OP should not at all afraid to use an A833 OD and a rear gear ratio around 3; it will get going just fine. BUT it will be 'good' but not be optimum for sprited street driving in hills and mountains ( missingthat 4th non-OD gear will show up there) and not be the best (at all) for drag racing. So if he is OK with that, then go with the lower gear + OD if wanted. All the above assumes a stock or mild torque cam so that low RPM torque is usable. Any level of aggresive cam will make it harder and harder to move out.