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Here's an article that highlights the changes yeay-to-year. http://www.edmunds.com/reviews/gener...6/article.html
Yes, you can bolt a 99 V6 into a 97 providing you are swapping an OHV for an OHV or a SOHC for a SOHC.
If you are swapping out an OHV for a SOHC, you will also require the computer for sure and not sure of anything else.