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It looks like a stock CRX Si engine, which is the aforementioned D16A6. If the valve cover says "16 VALVE" on it, consider that another indicator.
The stock HF motor would be a D15B7 (I think it's a 7 in the last position). It would also have the MPFI, but would be an 8-valve motor and not a 16-valve one. The intake piping would also look smaller, I think.
Most later D-series motors that are swap candidates would either have DOHC instead of Single Over Head Cams, or would have VTEC, which this motor does not appear to have.
All of those support the conclusion of D16A6.
-soD
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