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my 79 L82 has the same type numbers on the block pad, VO ?? 2500, i cant remember the first two numbers. no VIN data. it has the correct L82 intake, correct camshaft , 4 bolt main block,(no windage tray), and the heads are standard heads, when i pulled the bearings they had GM 81 on the back of them, i havent found any info to explain the numbers, i think its probably a dealer service replacement long block manuf. in 1981. the casting numbers on the back of the block indicate it was for i think 78-82 350 engine. so yours may be an over the counter block replacement . just fyi