None of the rebuild kits come with the internals. Those are hard parts.
The rebuild kits all come with the wear items like synchro blocker rings, sychro springs, bearings and bushings.
If you want the stronger internals, you'll need to fork up additional cash for the 90-93 cluster shaft and 2nd and 3rd gear or for the 2.95 super alloy gearset. They are not cheap