Found this sweet 1964 D100 truck this spring on the back roads of NC.
The Chrysler A engine of 318 cu in (5.211 l) was the smallest V8 option; and all of Chrysler's larger engines, with the notable exception of the Chrysler Hemi engine, were available as factory options. The original design was built until the spring of 1965, when the facelifted, single-headlamp version arrived.
1964 saw the introduction of the sporty Custom Sports Special. The Custom Sports Special included bucket seats, console, carpeting and racing stripes. The optional high-performance package could be ordered with a CSS truck or by itself on a base model truck complete with Chrysler's big 426 cu in (6.981 l) wedge-head V8. This engine produced 365 hp (272 kW) and 470 lb·ft (637 N·m)—in line with the muscle-car revolution that was then sweeping Detroit.