4 bolt small block.Should have a 4 inch bore. Make sure it doesn't have made in Mexico on it right near that number. Originally that number was from the late 60s to late 70s or early 80s. Supposedly a higher nickel block as denoted by the 10 but I think that's an old fable.
Not sure on the other number but I bet that one simply states how the drive train was configured in the original vehicle. ie 350 cu in, manual trans, AC.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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