In spite of working in a Ford dealership for nearly 20 years, I did own several Chevs, and many Studes. I was very active for many years in Studebakers. They, like every other engine, have various distinguishing items on them that most times, leads to a conclusion. The yellow valve covers, were for the most part, were used in 63-64, but not exclusively. The carb also was. But based on that, and the front of the motor, with thermostat housing, and a couple of other things, leads me to a 63-64. They were also the most common engine. 289s were about as common as 312s. EVERYONE had one in their car. I am trying to dispose of all my y-block and Ford stuff in general in order to get back into Studes one last time before it's too late. Unfortunately, I have not been able to sell much. The junk man has gotten most of it so far.