54 years later it can be anything. That's a dress up kit on the motor. First step is find the casting numbers on the block and heads. See if there is a VIN on the left side on the block just behind the intake manifold.
This is the motor in my 66. It looks like it could be a 66 with some aftermarket parts when if fact it's out of a 97.5 Explorer
The basic Ford Small Block V8 has soooooo many variations, 5 bolt (through about August 1964) and 6 bolt, 221, 260, 289, 302, 351, 5.0 5.8, solid lifter, hydraulic lifter, and on and on.
Couple that with aftermarket parts, and mix and match (late model heads on early block, changing crankshafts, stroking, boring, etc.) just "looking" at the engine is almost hopeless to casually figure out what it is.
A "C" code would originally have had a 6 bolt block and a "D" code would have had a 5 bolt block. The number of bolts refers to the rear of the engine where the bellhousing for the transmission attaches.