will a truck 883 work in an a body?

Specifically an 81 model,overdrive 4 speed.I can get one,that looks to be in extremely good shape.It has the shifter,rods,etc with it.I think i can get this transmission pretty cheap,and would like to put in my 71 dart.I know,i know,these arent good for performance,im more concerned with gas milage right now,and not having to run a 3500 stall converter.And,its so fun to rip through the gears once in a while,lol.I figure i can use this tranny until it blows,unless it just wont fit.What are the differences any ways,tailshaft length?Will the factory truck shifter work?Have any of you guys ever tried to use this tranny in your car before?