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Heres some details on the engine. I looked in every book I have , nothing is in the books for the engine suffix UC that I could find, the ONLY book listing anything starting with a U is the Big truck parts book , every code except UC. So I starting looking at everything in the way of dates. The purchase order is date 2-24-1964 , so I looked at the engines build date , 3-12-64 on the front pad. Made sense . The Carburetor date and number all showed up as for 327 1964 in the GM parts book. Intake dated C-12-4 or 3-12-1964. Spark plug wires dated etc. GM part numbers on all the fan belts. Pay special attention to the head markings on the front , looks like twin towers , that marking is truck and passenger car 327 according to the book Chevrolet by the numbers.