65 dart tranny upagrade.HELP

What engine are you using? The 67 and older engines had a smaller hole in the end of the crankshaft, then the 68 and newer engines. The later torque converter will not fit into the crank. Options:
1) early engine/ late trans, use early flexplate, and a special built converter, incororating the small pilot, and the late model (larger) input splines.
2) Early flexplate, early converter, and remove the front pump and input shaft and drums from the late trans, and install the same parts from the early trans.
3) Swap the crank for a late model crank.