727 for my 383 Dart Conversion Question..

2801543 67-68 383 2bbl ok, but lighter duty, narrow front drum bushing.

2961919 '70 Dodge light pickup, same as above and same as pass car application.

3410667 '70 C, E, and B bodies, same as above, except MOST likely to have console shifter bracket bosses on tailstock, which you may need.

4028824 '78 Big Chrysler, std performance. I'd look at this one carefully, as it may be a lockup valvebody. If a lockup, then I would change my answer to use the 3410667 instead. Count the splines on the input shaft to be sure...if a lockup, then there will 23 splines, the other three transmissions should have 24 splines, if no one has ever swapped out parts. Tough to know for sure without looking at them, as not all '78 transmissions were one or the other (lockup or non-lockup)

HTH, Lefty71