80's A998/A999 into Early A

The 904 behind the 273 in my 65 Valiant leaks pretty bad out of where the cables go into it. I do have a good 998/999(?) from an 85 Chrysler, which seems to have some sort of overdrive in it. Will the converter from the newer transmission work? I realize I'll need a yolk and the shifter linkage, anything else?