Does the manifold have a arm cast into it to mount accessaries, and does it have an X cast into the manifold? if so than it is proably a 57 or 58 manifold. Cadilac also had a tri power set up. I am not shure what year the end carbs went to a big bore but I think it may be 59 or in the early 60s. I have also seen different shapes in the holes for the coolant cross-over, some also have different shape water necks on them. Count the bolt holes where the intake bolts to the heads, if there are 10 bolt holes then it's a 65 or 66, if it has 12 bolt holes than it's a 64 or before. The early big bore end carbs can be used on a 65 or 66 manifold. Each of the end carbs is worth more than the manifold itself, end carbs are a lot harder to find than the manifolds.
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