What you need to get is the number on the block that is located behind the driver side head, but the suffix of TYY tells you exactly what the engine is.
Year = 1975
Cubic Inches = 350
Application = conv.cab
Horsepower = 165
Carburator = 4 barrel
C-10 to 2500 (meaning 1/2 to 3/4 truck engine)
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