Opti sensor replace or buy new distributor

Will be tearing into my opti on my 93 LT1, 68k, auto, in the next few days here's a what if question.
A buddy of mine has a NOS Mitsubishi sensor never used, if my opti is sound, bearing good, clean inside, new MSD cap and rotor with vent, would installing the sensor be a wise move or should I just order a new disributor from Petris? My buddy would like to get about $90-$100 for the sensor!
Reason I'm going into the opti is to chase down an idle miss in drive at a stop, been thru the entire system and even took it to a shop they said they recommended the opti be replaced.
Would appreciate any thoughts on this.

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Opti sensor replace or buy new distributor