Start by looking on the other side of the block for the casting date. It will be 3 or 4 raised (not stamped) characters. The first character is the month ( A Jan, B Feb, C Mar ... ), last digit is the last digit of the year and the middle digit or two is date of the month. Similar date codes are on the head and both manifolds.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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