Stock on the 92/93, it'* a 2:1 ratio, or very close to it. Your SC with the 2.55" stock pulley is running at twice your engine rpm'* (or very close to it). That should make for simple math by using your redline rpm'*. I don't recall the stock diameter (used to know it). And don't ask me, cuz my redline is different than yours now.
With my raised redline, and the 2.25" pulley, my SC is spinning at 13,600 rpm'* at engine redline.
Where are you getting a 2.3" pulley?