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my adive is carry all documents you should be fine. They would have called you for interview as this is very old case and want to make sure everything is fine.
carry all the taxes returns filed, W2, employment letter, pay stubs and all previous immigration documents, birth certificate, proof of living in US, marrage certificate (photos cards etc for spouse), keep all documents in nice folder and organise with labels on them.
Check all other posts for interview and carry documents they specified. By the way are you taking good lawyer with you that will help.
stay calm and answer to all questions and produce all documents Santa Ana office is real good one and INS officers are good.
Best of luck.
/Vguru