What gears should i run?

Yeah i'm thinking 3.55s on the low scale, 3.73s on the high, i'm just trying to decide now wether to find a used 3rd. member with a suregrip & pray it isn't junk, or get a new set of gears & spool this 741 case.

I'm going to call Doc-diff, he has gear sets for 185.00, i can get a full spool for 105.00, i'm sure the carrier bearings are good, maybe even the pinion bearing, just wondering if i can eliminate the crush sleeve & go with shims on this 741 case.