some Chris Craft engines were assembled by a company called "Dearborn" and the Ford V-8s were Dearborn Interceptors, they built 312s with an aluminum intake with 2 carter sidedraft 1 barrels in the valley mounted on the bottom of the manifold.
It most likely was a 292 as the 292 and 312 thunderbird engines both looked identical, both had the same valve cover decal but there were only 47 4 doors built with the 312 and thousands with the 292.