All OEM non race only Mopars made in that era had vacuum advanve, ALL ofthem.
Tell that dude his car may that been that way when he got it but it wasn't made that way from the factory
I've own more than one factory original 340 A body cars, 4 speeds and automatics
I wish now that I had kept the 1968 Cuda Formula S 340 4 speed car but I didn't