Not Ranked
The cost difference between the small in/small out and the big in/ big out is negligible. If you find a core, it is probably less than $100 dollars to build it as a big in/big out. The only difference is in the input ($10 difference) front bearing retainer (minimal), and the mainshaft ($10). You will need $30 to bore out the tail to accept the 31 spline and that is about it. The gears and synchros are all the same for either tranny.
As Anthony so correctly indicated, never assemble these transmissions with used parts.
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