Large U Joint question

not a dumb question. my questions-how is the budget? do U want to change a driveshaft to large 7290 rear U joint or use an adapter U joint? what is the last 3 digits of both pumpkins? 741,742,489? convert the small 1 to large by changing pinion yoke, simple on a 742-it has solid spacers, not as simple on a 489 with a crush sleeve