Help Decipher Engine Codes?

[Park]

Could anyone please decipher these engine numbers off my block? #V0506ZDD, #A207 18N, #1BS427242 Thanks

[JohnZ]

V0506ZDD = 1981 350/190hp TH350 Federal Corvette engine, built May 6th at Flint Engine plant.
1BS427242 = 1981 Corvette, built at St. Louis, 27,242nd Corvette built that year at St. Louis, produced on May 15th.

If your car's VIN ends with 427242, looks like the original engine.