Regardless of year, an original(or SR-service replacement)SD block will have the numbers 132 cast in the block where the usual 400 or 455 number would be; drivers side-front adjacent to the freeze plug.
Number 16 heads, round port of course and LS2 or LS2X cast on the top driver-side watercrossover of the intake manifold.
Let us know what you find.
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