Mortec lists the 14093627 as a 87 - 94 305 block. Colvin's books only go to around 75. The 5.0 also confirms a 305, the engine size was also cast in liters on later blocks. The casting date is probably 1986 not 1966 and be correct for 1987 model year car.
Don't know about 141001074, where is that casting number from?
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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