[AZKen]

No reason to determine big truck or pickup

From our own Jolly pages and archives:

" The 351E V6 which was available from 1966 to 1968 in 1/2 to 1 ton trucks is essentially a
Magnum engine, as it has the big port heads & bigger manifolds. If you ever run into
some old magazine adds from 1966 it mentions the 351 Magnum engine available as
a high performance option. The 351's were available both as Magnums & small port
head 351C engines up to 1972."

"Attached are the two carb bases for magnum and non magnum. The magnum trapezoid base is marked 60053 in the picture. If you have the manifolds for the 351, then the carburetor might be the only thing that wouldn't swap from 305 to your 351 without an adapter plate."

Right now I'm calling it a 351 magnum. In the daylight, the "black box" was a VR stuffed in there.