The highest value to date was a full Resto-Mod M715. Barrett Jackson last year... $32,000 for an LS-swap, modern axle, 4 wheel disc, PS, PB.
[I mean this in the best way possible] My guess is the "owners who want it stock" are starting to actually shed their OEM's.... New owners want the vehicle history.. but want to drive it with modern comforts.
Same thing happened to 50's cars where they fell flat when original OEM spec'd car owners started dieing off/selling their collections....
Stock M715's in appearance and powertrain have a 11-17k track run on Barret and Mecum...
My stock appearing but axle swapped, fuel tank relocated, power 4 wheel disc, modern axle, power steering, hydroboosted brakes, cummins turbo diesel, 5 speed OD manual I'd expect to bring $22-30k+ at auction. [powdercoated frame, repainted OD etc].
OEM trends just are NOT bringing that kind of money... [whatever side of the fence your on... selling prices are selling prices and are indicative of demand] Too many younger guys don't want to buy manual brakes, manual steering with a constant upkeep motor. Older buyers who want the nolstagia of OEM are simply no longer buying but shedding their vehicles. (67+ years of age is when owners start shedding their collections... not buying more) [Hemmings]
67' M715/5.9 Cummins/ZF5/NP205