That's interesting. It apparently wasn't used on our light-duty trucks as there's no "12450" in our MPC. And a 12450 was mentioned in the 1980 - 89 Truck Series 600/900 MPC, but only for the big V8's. So I'm guessing that there's an MPC for industrial use, like generators or aircraft tugs, where that governor is listed.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI